I downloaded Microsoft Windows Defender from MS, and XP would not allow me to install it, saying it is from an unknown publisher.  How do I tell XP that it is ok to install it?\nThe software was downloaded and saved as a file.
208740
You'll have to go into your internet options, security settings and lower your security level.\nTools, Internet Options, Security, Custom Level
549180
Try make it a genuine one from .....www.microsoft.com........\nwithout making ur operating system genuine u won't be able to download any software from microsoft web site.\nAnother method which i would prefer is that make him format the WIN XP drive and re-install it,and at the time of completion after reboot the operating system asks u to connect to internet asking the IP addresses and all other addresses(It will for 5 IP addresses), enter all the IP addresses and click NEXT then a page apperes for regestering ur operating system.Click for regestering it.And fill out the simple form, hence by that u r registered to Microsoft.\nThen u can download any number of softwares.\nThis way is for free registration.No need to pay any amount.\nEven i i do the same.........till now.
280436
All the other things will stop working if you wipe it clean and start over. However, you should be able to re-install a legitimate copy of Windows over top of the existing one and everything in the registry for the other programs will be kept, and the programs should still work....even if they are counterfeit.\nMine came with XP Home Edition already installed.
49645
How to Order Additional Licenses for Windows XP Home Edition\nhttp://www.microsoft.com/windowsxp/home/howtobuy/addlic.mspx\nThis is the legitimate way to install and register the same copy on more than one machine and still have full support and updates.
359019
yep it because microsoft has created an update to find the people who are illeagaly using there software. The best advice I can give you is to buy a new copy of XP so you have your own #.
242121
Its spyware and adware, go to microsoft.com and download the Defender,  its free and can be trusted.
47311
Microsoft is very strict with their new licensing terms.\n\nYour copy of Win XP Pro is valid for a single or dual processor machine.\n\nMicrosoft has stated that the product is valid for one machine only. You cannot remove the product from one computer and install it on another. If you upgrade your processor and motherboard, your copy of XP is valid only for the previous components, and not your upgraded computer.
644555
Your only option at this point is to contact microsoft. If its a valid version they will give you another key. Windows xp key only works twice to begin with and then you have to contact them. If you are trying to boot a copy forget it! the encryption is almost infallible!
113379
Under the circumstances, a clean install would be the best option. Delete the 3 directories ie. PROGRAM FILES; WINDOWS; MYDOCUMENTS and you're over with Win9x. Boot the computer using the XP disc and pick up the setup from there.
609524
if u wanna fresh copy, then please visit http://www.microsoft.com/windowsxp/sp2/default.mspx\nbut, if u wanna pirated copy go to some pirated sites:\nwww.serials.ws.
118124
Hello Needy:\n\nThe pirated software you have is no good because it requires you to register with Microsoft over the internet. If you dont register, your software will be deactivated with reduced functionality. If you register online, you will be prompted to convert your software into a genuine  copy. It may cost you around $200-$300. Gone are the days when one could use a pirated copy of XP/OFFICE and other Microsoft products.\n\nSorry, you have to BUY the software license.
119517
Should have come with your software. Unless of course you bought a pirated copy :( I believe I read something about XP and future editions of Windows will be configured to become inoperable on the host computer if the key is entered into another computer (like if you buy a new computer and load your copy of xp on it, it will become inoperable on the old computer)
311958
No, you aren't in trouble, but you do apparently have a bogus or pirated copy of XP.  Where did you get it?  If you bought it, you should have a key affixed to the CD case.  Try it again, making sure you aren't making some error, caps lock on, etc.  It's easy to mix up a B with an 8, that type of thing.  If it still won't work take it up with the seller.  If it's an OEM that came with the computer, look for a restore disk.  Worse case scenario is you will have to purchase a good copy of XP.  If you were ripped off by a retailer, and are willing to give MS the information about it, they may give you a discount to get it fixed.
237225
Is there a sticker on the back of the pc with the product key on it? There should be. Do you have the xp install disk?\nYou need one or both or you are out of luck. \n\nIf you have the sticker, key the product key from that sticker into the box. If that does not work, and you have the cd, try reinstalling xp and entering the product key from the sticker. \n\nIf you do not have a product key, you have no way in and you will have to buy a copy of xp or Me or 2000.
591134
Microsoft change his policy that now they never patched computer who is not genuine. And so they release new patch for it via auto updater. But its not big issue if you dont mind about that. Just use your computer as like before and ignore warning.\n\nOtherwise Buy genuine Windows Copy.\n\nGood luck!!!!!!!
507728
http://www.softwarepatch.com  is the only site you need for fixes with your xp not being valid.here you can get any & all updates or upgrades microsoft issues.no validation failure there.and yes you need the ctmon.exe file.it is most likley still there only thing deleted was probly a virus file look alike.if not can get back from this site   http://www.dll-files.com/  enjoy these sites as i have.no bill gates stoping you there.
528246
You can't download it.  If it came preinstalled on your computer you can try to re-add it by going to Add/Remove Programs and click the Add/Remove Windows Compnent Box.  Or if you installed with a CD pop the CD into your hard drive and try to repair the installation.