More computer problems..

[TheGame]

So, tonight I decided to defragment my hard drive. Later on in the evening I happen to go on a website that has some virus attached. Normally when something like that happens I try to do a system restore, but since I defragmented it won't allow me to do so...

Whatever the virus is, the scanner only detected it at first, and deleted half of it. But when I scan for a spy or a virus it finds nothing now. But I know something is wrong because no matter what website I go to I get completely unrelated pop ups, and on fire fox I constantly get the message that I'm sending info under an unencrypted line even when I'm putting in no info.

I'm running two pop up blockers, yet whatever this virus or unwanted add on is, it breaks through that to do pop ups.

Have any of you had this problem before? And if so, besides doing a system restore, how have you gone about fixing it?