System Alert!

http://i112.photobucket.com/albums/n195/4thcoming/naamloos.png

I've been getting this popup all day, and I don't trust it... I bet if I click it, it installs spyware instead of getting rid of viruses. I've got two good virus scanners, and neither detects anything.

Question is, how do I get rid of the damn popup?

>>1
>I bet if I click it, it installs spyware

The fact that it's appearing at all means you already have malware on your system. Not all virus scanners pick up adware/spyware/extortionware. You need AdAware, SpybotS&D, Windows Defender or similar to get rid of this (try System Restore to before the pop started appearing first - that can be enough in some cases). But still run a trusted anti-spyware package after too.