Shoutbox

Today I was reading around forums on another website and was searching around the internet because a glitch problem someone was having. During this I was having a problem with the window and closed along with it was one of those "Send Error Report" pop-ups. After I clicked "Do Not Send Error Report" I was blue screened and it restarted. After it restarted I notice that it was loading oddly slowly. AIM, Xfire, and MSN were not opening. So currently I am using mcafee (free trial on my laptop) to scan my computer. I don't think it is doing the trick so I was just wondering if anyone knew a free trial of a really good trustable virus/trojan scanner. Thank you in advance for any help that can be provided.