How do I remove these computer viruses?

When the computer first boots, do ctrl+alt+delete and open the task manager, from there, go to processes, and look for any that are abnormal looking, normally they consist of about 10 random letters/digits. Right click said process and click end process tree. From there, you should be able to install the software and run the virus program immediately. You have to start the task manager as soon as the computer starts. Also, disconnect any sort of internet connection. This is the only way to do this. I have had this virus attack before on another computer in my household. Normally this comes from an insecure browser. Normally IE which has a hole that the viruses get through.

Your brothers friend computer has a virus. is an easy job in regard to many soft wares which are available.you should try try the antivirus which have been tested and are known to be the best in the market. some of the software which are in the market are also viruses. Try these anti-spyware removal tools

You need to use a LiveCD Anti Virus and boot this on the computer, that way it will not be in the Windows Operating system and can scan every files that is on the computer. But how you tackle this issue or problem is really your own choice and decision.

its just one of those ad viruses not very harmful just very annoying, quick solution is to boot in safe mode,and just delete/uninstall what ever is program is causing it, then just boot up in normal mode

boot your computer in safe mode..or another way is scan your computer with good antivirus ..norten or avast.etc.

boot in safe mode malwarebytes removes malware, not viruses in safe mode (i know you cant boot into that, but logging into debugging seems to fix this sometimes): install avast...the free version. run it and see if it corrects the problems. if that doesnt work, try deleting the profile (back up what you want to keep) and recreating it OR try combofix...its a heavy piece of software, so read the warnings before you run... heres a link but i would suggest doing your own research as well (this is not a virus removal too, but an aggressive malware removal, what you are discribing sounds like malware)

It sounds like a rogue infection. The messages claiming to have detected viruses, and urging you to buy the product to fix everything is classic rogue rubbish. If it IS a rogue, it would help to know the name. For now... Try this: Firstly, boot your computer to the Safe Mode menu screen. You do this by repeatedly pressing F8 as soon as you boot up. Once there, use the arrow keys to highlight Safe Mode with Networking. Continue to boot from there, by pressing Enter. Start Internet Explorer, and when the program is open, click on the Tools menu and select Internet Options. Now click on the Connections tab. Now click on the Lan settings button. Where it says Use a proxy server for your Lan, remove the tick in the tick box, then press the OK button to close this screen. Now press the OK button to close the Internet Options screen. You should now have web access. Copy and paste this link into your browser’s address bar, and press Enter. It's a direct download for RKill. Save it to your desktop, then run it. When it's running, your desktop icons will vanish for a few seconds. When the notepad report is displayed, just close it. You may now delete RKill if you wish: http://download.bleepingcomputer.com/grinler/rkill.exe RKill SHOULD HAVE STOPPED THE ROGUE FROM RUNNING, BUT IT WON'T HAVE REMOVED IT. Now open your browser and copy and paste this link into the address bar, and press Enter. It's a direct download for the free version of Malwarebytes' Anti-Malware (MBAM). Install it, get updates and run a full scan (still in Safe Mode): http://www.myantispyware.com/mbam After this, try rebooting normally. If that's successful, I recommend you run another full scan with MBAM. It will detect malware that wasn't running in Safe Mode. Malwarebytes' Anti-Malware can be easily uninstalled, should you wish to do so, but it may prove to be beneficial in the future. Hope this helps.

Microsoft Safety Scanner So you think your PC has a virus? The Microsoft Safety Scanner is a free downloadable security tool that provides on-demand scanning and helps remove viruses, spyware, and other malicious software. It works with your existing antivirus software. Note: The Microsoft Safety Scanner expires 10 days after being downloaded. To rerun a scan with the latest anti-malware definitions, download and run the Microsoft Safety Scanner again. The Microsoft Safety Scanner is not a replacement for using an antivirus software program that provides ongoing protection. For real-time protection that helps to guard your home or small business PCs against viruses, spyware, and other malicious software, download Microsoft Security Essentials. http://www.microsoft.com/security/scanner/en-us/default.aspx Malwarebytes also has a Forum that maybe helpful Malware Removal Guides and Self Help Guides http://forums.malwarebytes.org/index.php?s=2db8b073f430511510cc162c20456de0&showforum=39