My PC has been infected by a heuristic virus

Hello,

My PC has been infected by a heuristic virus after downloading a program called IPADIAN. It forces itself to my search engine and my home page browser. Also, although Norton 360 has detected it at first, yet it is still there.

I tried GMER as advised at this thread:

http://community.norton.com/en/forums/been-hit-virus-and-heuristic-virus

Yet, it doesn't seem to complete the scan, it gets interrupted in the middle stating that: C:\windows\system32\config\system: The process cannot access the file because it is being used by another process. other messages appeared as well such as: C:\windows\system32\config\software cannot be accessed.

Can somebody help?

Thanks,