Not sure how many out there have tried the new Microsoft Security Essentials which is on beta, but we reckon it might be a good idea after we discovered it's protecting and finding stuff other anti-virus software just aren't picking up, like a Trojan exploit on some of those dodgy websites or hacked websites. If your running Firefox then you should be OK as it usually blocks such sites, but IE is venerable to load them.

If in doubt, it would be worth downloading the beta, which is free, and scan your system. Once the MSE is installed its non-intrusive and doesn't seem to slow your PC down like some Anti-Virus companies products do.

For more info click this link to Microsoft Security Essentials