Originally Posted by CarbonMonoxide
You still have malware on computer, and/or your Hosts file is corrupted.
I suggest IE8 with has built in antimalware/antiphishing and smartscreen
Try these: ESET SysInspector
Download and Install NOD32 4 Free Antivirus Download from ESET
Run Windows Defender (full scan)
Start> in search bar type defender
run Malwarebytes (this will detect polymorphic malware) Malwarebytes.org
This is a On demand Scanner only (real time detection mode disabled in free version)
This is a specialized tool specifically targeted at polymorphic Malware
, and as such is not very effective against other malware threats. It is also meant to be run in conjuction with installed Antivirus- not as a standalone app further note-
Chances are you may have suffered Windows corruption that only a repair/re-install may fix.
barring that, and you use the above tools to clean your system, you can improve speed and performance here: How To Make Vista more responsive and faster