Ok follow these steps and hopefully it will get rid of it for you.
1-disable system restore.
2-boot into safe mode, go into MSCONFIG and remove it from the startup window.
3-delete it from the file it's in, try C:\Documents and Settings\yourusername\Local Settings\Application Data most of the time it would be there. you need to view hidden folders to get into this.
4-Clear all temp files. I would do another full virus scan in safe mode
then reboot normally and see if that serves you.
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