Seems you need a full cleaning of virus and rootkits (hidden virus).
I suggest you visit this page http://www.antirootkit.com/software/index.htm for antirootkit detection, removal & protection.
First close any other programs you have running as this will require a reboot
Double click MsnVirRem.exe to run it
Once open, click the button labelled “Search and Destroy”
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When scanning is finished you will be prompted to reboot only if infected, Click OK
Now click the “REBOOT” Button.
After the Reboot, you WILL receive file not found errors (usually 4) please acknowledge them and continue.
A Message should popup from MsnVirRem if not, double click the program again and it will finish
Please Post the contents of C:\msnvirrem.log along with a fresh HijackThis log.