So a person we know pretty well just brought her (ancient) laptop here, says she has a virus on it. The virus immediately makes all downloaded files branded as 'virus, potentially harmful for your PC', hence she can't download anything anymore. I installed SUPER AntiSpyware & Malwarebytes, they found a lot of things but the virus isn't gone. I used both the free versions. I also ran a quick Microsoft Security Essentials scan, didn't find anything...... I've uninstalled Chrome (her browser) 3 times, even with REVO Uninstaller, the next time I install Chrome (downloaded on another PC, transferred via USB), it gives the same problems. Even Internet Explorer can't download anything (it marks it as virus again...), I haven't tried Firefox though. So basically, what can I do? All browsers seem to be marked, and the 3 Anti virus programs I usually use don't find it.... I can format, she's bringing the Windows DVD tomorrow, but that's of course last option.