Best free and not free antivirus, firewall and spyware sweeper?
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Best antivirus (free ver): Grisoft AVG\n               (paid ver): Symantec (Norton) AntiVirus\n\nBest firewall (free ver):  Zone Alarm\n              (paid ver):  Zone Alarm Pro\n\nBest antispyware(free ver): Microsoft Defender (Beta 2)\n                (paid ver): Webroot Spysweeper 4.5
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best antivirus: NOD32\nbest firewall:  ZONE ALARM PRO\nbest anti-spyware: WEBROOT SPY SWEEPER
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◙ The very best virus scanners are free. Mcafee & Norton Antivirus are mostly hype and won't do as good as the free ones. -- About.com & Smart Computing Magazine\n\n◙ Download and install AVG. Use it first and see if it finds any viruses or trojans.\n\n► http://www.grisoft.com/\n\n◙ After running AVG go here and run this virus scanner online. There is no need to install it on your computer.\n\n► http://housecall.trendmicro.com/\n\n◙ Best spyware remover is Ad Aware. Download and install the free version.\n\n◙ http://www.lavasoft.com/\n\n◙ Here is a wealth of information about fighting spyware and spyware producers. Join their free forum for answers to your questions. -- Smart Computing Magazine\n\n► http://www.spywarewarrior.com/\n\n◙ Before downloading email attachments in Gmail and Yahoo Mail click on the link that says, "Scan With Norton Antivirus".\n\n◙ Before downloading any software from the internet type it into http://groups.google.com/ to see if that title is known for spyware or viruses. Google Groups has over 1 billion posts spanning 25 years to help you. Even after checking it there ALWAYS scan it before opening it. You just can't be too careful. -- Smart Computing Magazine\n\n◙ A lot of the download sites like http://www.download.com/ and http://www.tucows.com/ scan software before releasing it to the public. But just for safety sake you should still scan it yourself.\n\n◙ If you have a broadband modem or network router the firewall in these is not as effective as a software firewall. The firewall that comes with Windows XP isn't very good either. Download ZoneAlarm and your system will be a lot safer. -- Smart Computing\n\n◙ http://www.zonealarm.com/
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McAfee has the latest Internet Security that includes \nVirusScan \nPersonal Firewall Plus \nSpamKiller \nPrivacy Service \nIs the 2006 one and is only 49.99 dollars, its worth. I also wanted free software protection, but did never found a good one, the only free ones, they don't do a sh-it, because they are free. But please do install it, just you will pay on time in one year. Try it!
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If you want a free alternative try  AVG Free Edition as an anti-virus. It haven't given me any problems.\n\nNorton Products suck. I bough Norton Antivirus with Firewall and it stopped working. I had to unistall it.\n\nSpybot Search and Destroy, Ad-Aware are good for spyware.\n\nCcleaner is good for eliminating unwanted files, history, cookies, crap from your computer. Making your computer more functional. It also fix some registry problems.\n\nZonealarm is a good firewall that is free.
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While you are on www.download.com, go for Antivir personal edition. Free and effective. Bitdefender is another good stuff. I paid for it, I am using it for a year, but there is also a free verion available.\n\nAs people answered, adaware and spybot are very nice tools. \nCCleaner is a cleaner to protect your privacy. Very good and trouble free. Can help to get your PC faster.
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Personally, I prefer the Avast Antivirus. Out of the many products available, it puts one of the smallest drains on system resources (It slows you computer down the least). There is a free version available, and the only valuable feature it lacks is an option to schedule a recurring scan.\n\nI also use Zone Alarm firewall. It also has a free option, but you can upgrade to pro to enable advanced options and Anti-Spyware proteciton.\n\nLook at these products for anti spyware (All have free versions): Adaware, Spybot Search & Destroy and Microsoft Windows Defender.
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1) AVG anti-virus: http://free.grisoft.com/freeweb.php/doc/2/\n2) Ad-aware spyware remover: http://www.lavasoftusa.com/products/ad-aware_se_personal.php\n3) Spybot - Search and Destroy spyware remover: http://www.safer-networking.org/en/index.html\n4) CCleaner - registry and privacy cleaner: http://www.ccleaner.com/
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I use the free ones - using more than one works best, because none of them catch everything.\n\nMy favorites (for PC):\nSpybot Search & Destroy\nMicrosoft Anti-Spyware\nAd-Aware SE Personal (from Lavasoft)\nSpywareBlaster\n\nGoogle 'em.
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Spybot search and destroy.....for other malware try ad-aware SE...these are both free. For viruses I have tried Norton and McCafrey, but I hated them. I use AVG 7.1...It is free and works like a charm. Windows defender is not very good. I have XP SP2 and use the three I listed above earlier. Good Luck!!
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Try Spy Sweeper, Webroot has a free trialware good for 15 days.  If you aren't going to any other websites after cleaning your system and reinfecting it, someplace on your computer they are being rewritten.\n\nSpy Sweeper has never let me down, it even cleaned out the last vestiges of the nefarious CoolWebSearch that Adaware and Spybot missed.  But, it slows my computer to less than a crawl.
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Spybot is very good, and free.\nhttp://www.safer-networking.org/en/index.html
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Here is a list in order of how you should install and run them to clean sweep a computer.  They all have their strengths and weaknesses, and you need to run them all in order to catch everything.\n\nComodo AntiVirus\nAVG Antivirus\nCounterSpy\nXoftSpy\nZoneAlarm Pro
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★★★ Computer Security Software & Tips ★★★\n\n◙ The very best virus scanners are free. Mcafee & Norton Antivirus are mostly hype and won't do as good as the free ones. -- About.com & Smart Computing Magazine\n\n◙ Download and install AVG. Use it first and see if it finds any viruses or trojans.\n\n► http://free.grisoft.com/doc/1\n\n◙ After running AVG go here and run this virus scanner online. There is no need to install it on your computer.\n\n► http://housecall.trendmicro.com/\n\n◙ Microsoft's New Live Safety Center. Download this scanner to check and remove spyware, viruses, get rid of obsolete files and junk off your computer, and improve your PCs performance.\n\n► http://safety.live.com/site/en-US/default.htm?s_cid=msep\n\n◙ The Microsoft Windows Malicious Software Removal Tool checks computers running Windows XP, Windows 2000, and Windows Server 2003 for infections by specific, prevalent malicious software?including Blaster, Sasser, and Mydoom?and helps remove any infection found. When the detection and removal process is complete, the tool displays a report describing the outcome, including which, if any, malicious software was detected and removed. You can run this tool online FREE.\n\n► http://www.microsoft.com/security/malwareremove/default.mspx\n\n◙ Best spyware remover is Ad Aware. Download and install the free version.\n\n◙ http://www.lavasoft.de/software/adaware/\n\n◙ Here is a wealth of information about fighting spyware and spyware producers. Join their free forum for answers to your questions. -- Smart Computing Magazine\n\n► http://www.spywarewarrior.com/\n\n◙ Before downloading email attachments in Gmail and Yahoo Mail click on the link that says, "Scan With Norton Antivirus".\n\n◙ Before downloading any software from the internet type it into http://groups.google.com/ to see if that title is known for spyware or viruses. Google Groups has over 1 billion posts spanning 25 years to help you. Even after checking it there ALWAYS scan it before opening it. You just can't be too careful. -- Smart Computing Magazine\n\n◙ A lot of the download sites like http://www.download.com/ and http://www.tucows.com/ scan software before releasing it to the public. But just for safety sake you should still scan it yourself.\n\n◙ If you have a broadband modem or network router the firewall in these is not as effective as a software firewall. The firewall that comes with Windows XP isn't very good either. Download ZoneAlarm and your system will be a lot safer. -- Smart Computing Magazine\n\n► http://www.zonealarm.com/\n\n◙ Here is a really great article on browser hijacking. This will show you how to get rid of it. There is a tutorial and software to get rid of part of it. You'll need to make some changes to your computer's registry to get rid of the rest of it. Click on the chatroom link on their main page if you need help.\n\n► http://www.spywareinfo.com/articles/hijacked/\n\n◙ Here is Yahoo!'s Internet Security section.\n\n► http://security.yahoo.com/\n\n◙ Get more information at these PC Magazine Web sites.\n\n► http://www.pcmag.com/\n► http://www.smartcomputing.com/
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There is a Microsoft spyware remover: Windows Defender Home. It´s free
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AVG antivirus\nZoneAlarm Firewall\nSpyBot S&D\nAdaware Personal
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My personal favorite is Zonelabs ZoneAlarm Pro.. but just get the firewall pro.. they have different versions that come with antivirus and antispyware programs... but just the Firewall is all you really want from them.