Can't fix System Infected: Tidserv Activity 2 but Full scan runs fine

Hi,

A message pops up "System Infected: Tidserv Activity 2  Manual removal needed."

 

I am running XP Pro on a PC, all latest authentic software, Service pack 3, with all updates enabled.

 

I followed the Norton security message instructions to manually remove the infection....I disabled System Restore, downloaded the FixTDSS.exe and ran it.   It said it could not find the infection.

 

I ran a full system scan which came back clean.

 

The message "System Infected: Tidserv Activity 2  Manual removal needed." keeps coming up.  I have switched off my PC as i am afraid the infection may worsen.... and am using my wife's laptop.

 

Any advice or suggestions on what i could do?

 

Thanks,

Dave