This answer was cut copy and pasted from Yahoo Answers.
Antivirus 2010 is a rogue anti-spyware program that displays false and exaggerated scan results. Thankfully, though, there is a totally free way to remove this program.
Please visit this page and follow the guide in order to fully remove this program and any related malware:
http://www.bleepingcomputer.com/malware-…
Please note that some programs only scan your computer and do not remove anything for free. Use programs that do not require you to purchase them in order to remove found infections. The guide above includes a program that will remove this infection entirely for free.
If you feel comfortable doing it, here is a manual method taken from Yahoo answers as well, that involves editing your registry... Only do this if you know what you are doing with the registry. Registry mistakes can cripple your computer.
Antivirus 2010 is clone of ANTIVIRUS XP: Antivirus XP is fake antivirus software program. (it has many clones like ANTIVIRUS XP 2008, VISTA ANTIVIRUS, SMART ANTIVIRUS, MS ANTIVIRUS, MICRO AV2009, SYSTEM ANTIVIRUS, etc) . This program is typically known to infect a computer just after performing an install of specific video codec. This corrupted video codec is usually distributed with a Trojan, Malware and Virus. It is crucial to remove all the components of XP Antivirus and all malware and trojans such as zlob.trojan, trojan.vundo and trojan.downloader that may have been installed along with it. The following tutorial explains how to remove this XP Antivirus Protection.
Simply, It's a virus designed to extort money from you by demanding you pay for the "full version". to remove the viruses that it has "detected".
Navigate to Start-> Run, type cmd in the box and click Open
In the command window, type regsvr32 /u shlwapi.dll and press Enter
Next type regsvr32 /u wininet.dll and press Enter
Next Press Ctrl + Shift + ESC
Right click on XPAntivirus.exe from the processes window and select the option to end process
Right click on XPAntivirusUpdate.exe from the processes window and select the option to end process
Navigate to Start-> Search, then click on Files and Folders. Search for and delete the following files:
XPAntivirus.exe
XPAntivirusUpdate.exe
shlwapi.dll
wininet.dll
XP Antivirus 2008.lnk
Uninstall XP Antivirus 2008.lnk
XP antivirus
XPAntivirus.lnk
Uninstall XPAntivirus.lnk
XPAntivirus on the Web.lnk
XPAntivirus.url
Navigate to Start-> Run, type regedit in the box and click Open
Delete XP antivirus in the following path: HKEY_USERS\Software\
Restart your PC and everything should be back to normal
Note: If you dont know much about Registry, Please do not do the steps above because you may delete some usefull strings that may harm your computer. So better download an auto xp antivirus remover software.