My friend's netbook pop out a win 7 total security alert, shows that it found 31 virus on the Windows 7 system.
A sample of the message looks like this:
After scanning the system with other anti-virus software, found nothing. Spend some more time search through the Internet, seems like the win 7 total security alert is the virus (malware). It gives false alarm about virus, spyware and malware on the system. It may appear as different name like Win7 Anti-virus, Win7 Anti-spyware, Win7 Internet Security 2011... check here.
How to remove? Use other virus/spyware/malware scanner. Manual step by step instruction is available as well, check the website here, here and here.
You can try use Superantispyware and Malwarebytes, a solution from Yahoo answer.
If you think the steps are too complicated, ask help from your friends, or you may consider re-install the Windows.