kyoisKILLINGME

I run Microsoft Security Essentials, which is great by itself, but I've also got Malwarebytes too run a second test just in case. Both are free and very user-friendly~

http://windows.microsoft.com/en-us/windows/security-essentials-download

http://www.malwarebytes.org/

thanks ^^

Seconding Miasma, I however also have Spybot S&D and another helpful app is if you use Firefox or Chrome and grab the extension WOT. It'll flag bad URLs for you before you even click on them so you don't accidentally find yourself on some infested malware website.