Boot into Safe Mode

 

Shutdown and Restart and Boot into Safe Mode by tapping the F8 key when you see the PC
maker's logo.
Keep tapping until it tells you it is going to Safe Mode or you see the Safe
Mode menu. Select the top option.

and let Norton do a full scan and see if it can delete the file.  If that doesn't work then get the rootkitrevealer from sysinternals and see if it can help:

 

http://www.sysinternals.com/Utilities/RootkitRevealer.html

 

As far as HijackThis goes it only shows some remnants that you can check and Fix Checked.

 

O2 - BHO: (no name) - {549B5CA7-4A86-11D7-A4DF-000874180BB3} - (no file)
O2 - BHO: (no name) - {FDD3B846-8D59-4ffb-8758-209B6AD74ACC} - (no file)
O9 - Extra button: PartyPoker.com - {B7FE5D70-9AA2-40F1-9C6B-12A255F085E1} - C:\Program Files\PartyPoker\PartyPoker.exe (file missing)
O9 - Extra 'Tools' menuitem: PartyPoker.com - {B7FE5D70-9AA2-40F1-9C6B-12A255F085E1} - C:\Program Files\PartyPoker\PartyPoker.exe (file missing)
O9 - Extra button: (no name) - {CD67F990-D8E9-11d2-98FE-00C0F0318AFE} - (no file)

 

Ron