I've gotten attacked by this annoying as hell vista internet security 2010 twice(second time it was with a different name) This is an annoying trojan, that simulates you having been attacked, it simulates a system scan, making you think it is actually scanning your computer and fixing trojans, but you'll quickly catch on to its charade. You'll see taskbar bubbles like "System hijack". The first attack it took me a few hrs to get rid of the damn thing.... note, it comes us with a message sayung it blocked Firefox when you try to start FF,but just "x-out"(close the message) and your FF browser will pop up.... so I quickly used google to look for a solution, but it was a long look. I found a guide that tells you to alter some Windows Registry values, I did that, but it did not work, and it took a long time, and I actually messed up how the FF icon works! .... But alas! I found the solution!

Here it is! MalawareBytes' Antimalaware!

Free version works just fine!

Start full scan, wait 45mins - 2hrs for it to finish, then finish the handling the infections/files

The second time this happened(under a different name), Norton Internet Security picked it up apparently, I noticed a dialogue box from Norton, saying it caught a trojan, this was in the middle of running a scan by MalawareBytes.

Strange thing is, both times I got this thing, I wasn't browsing strange sites.... Do you happen to know how and from where it comes?