You did not answer jgweed's question about running your anti-virus in safe mode and whether it found anything.
If you have not performed a scan in safe mode then do so. If you have no success after that then do the following:Download and scan with Ewido Anti-Malware v3.5Ewido Install and Scan Instructions
Download and scan with Ad-Aware SE Personal
and install it. If you already have Ad-Aware SE, please setup & configure as shown here
.Download and scan with Spybot S&D 1.4.
Setup & Configure as shown here
[DO NOT choose the option to install TeaTimer]
Note: If you encounter any error messages while downloading the updates, manually download them from here
.Perform these online Virus scans
[Watch the Address bar in IE. You may receive alerts that "This site might require the following ActiveX control...Click here to install...". Click on that alert and then Click Install ActiveX component]Trend Micro Housecall ScanPanda ActiveScan
ActiveScan Panda does not remove adware/spyware but will autoclean for viruses & worms.