how virus/antivirus works?
98767
virus work:\nmost likely virus in the real world\n\nanti virus work:\nscanning files/memories comparing every bit with "signature" that already known in the virus database.\nthen do whatever it should take (delete/cure/quarantine)
301248
When u install an anti virus software, it resides in the primary memory(RAM). So the RAM space gets reduced & hence the system slows down.\n\nJust imagine u build a divider too wide on a road, obviously the road width decreases & the traffic moves slowly than before. Same is the case here.
485638
internet security and antivirus programs often come packaged together.\n\nInternet security would include things like a pop-up blocker and a firewall to stop bad programs being downloaded.\n\nantivirus I think would scan files which have been downloaded\n\nin general internet security is prevention and antivirus is the cure. Having both is usually a good idea.\n\n\nedit: yahoo has its own virus scanner for attachments which is separate from anything you have on your computer
682853
what operating system?\n\n...run antivirus and antispyware
340294
try using safe-mode.\n\nmost worms/viruses doesn't work on safe-mode.\nto start windows in safe-mode press F8 before windows start loading.\n\nthen you can run anti-virus on safe-mode to remove the file or manually delete the infected file.
333477
Many viruses shut down the antivirus program. Best to do an online scan to see if you have something.\nhttp://housecall.trendmicro.com/\nI had McAfee do the same thing to me before without a virus. I ended up having to reinstall it, then it was OK.
656212
Virus is malicious programming....Like starting something without providing an end to it...\nHacking is the way through which you can break the security on internet
771310
Ok, that's a lot of questions.  A great anti virus software that is free is called Zone Alarm. \n\n1)    This is iffy, a lot of ani virus programs will fight with one another, I recommend just installing one.\n\n2)     See question one\n\n3)     It will stayed turned on all the time, otherwise, what's the point?\n\n4)     It depends on the email program that you are using.  Are you using a program like Outlook?  That requires a plug in to do so....  If you are using Yahoo or hotmail, it's internet based.  In both cases, it will scan for viruses.  Most online internet programs already have a built in virus scanner.
7113
AVAST ------->   Free virus protection for your home PC\n\nNew viruses are being found "in the wild" all the time. Further, the speed at which these new viruses spread is increasing all the time. A key problem is not that antivirus programs do not detect such viruses, but the fact that most users do not use any antivirus program at all or, perhaps worse, the antivirus software and / or virus definitions database is out of date.\n\nALWIL Software, the producer of avast!, decided in June 2001 to help to solve this situation by offering avast! Home Edition free of charge for home users who do not use their computer for profit. To get industry leading antivirus protection for your home PC, download the software, and then register it.
43779
Just use an anti-virus program. A good free anti-virus program is Grisoft's AVG. It can be found at http://free.grisoft.com/
246276
You have to download them after the virus scan.  Its kinda like a 2 step process, at least when I download things.
865286
Even though your particular virus scan did not pick anything up, your computer is still badly infected. No single one virus scanner can detect 100% of all viruses and other malware !00% or the time. \n\nI would suggest that you try both of these free on-line scans (no download needed)\n\n1. Scan for virus and remove (free online scan) with BitDefender\n\nhttp://www.bitdefender.com/site/home/\n\n2. Scan for trojans and remove (free online scan) with Ewido\n\nhttp://www.ewido.net/en/\n\nGood luck.
615525
I don't know how viruses work. I guess it is possible but wait for the other answers. People do horrible things these days with computers.
275508
There is no antivirus that can solve all problems ( In my opinion =)  )\nDepends on how vulnerable your PC is, you can run different programs periodically to detect malware.\nI personally used all of the free online scanner below.\nKapersky, Activescan Panda, Trend-Micro, Norton security response. AVG is pretty good as well.\nLast thing is, use firewall, anti-spyware program if necessary.
609652
each virus is different, so you'd need to know which one it was...or know in-depth how your os works (and that is a book, not a post at yahoo answers)
124152
viruses is too general.\n\nTrojans spread by hiding inside other things, usually email, though email is not the only vector.\n\nspyware does not usually attempt to spread once on your system....however, they use trojans/worms to open backdoors on the PC, and THEY will sometimes spread.  spyware comes in 2 flavors, broswer monitoring, and keyloggers-programs that record every keystroke pressed and send it via internet to a 'bad guy' somewhere. useful for collecting personal info and passwords, financial etc.\n\nhope this helps !
655409
There is no easy way to explain this.\nSo I suggest you read up this\nhttp://en.wikipedia.org/wiki/Computer_virus