Hi here are some things to try.  First scan with the anti virus on the PC make sure it is updated.  If the virus is not gone do a free online scan from Housecall or another anti virus maker, remove what it finds.  Serach Symantec for XP internet security version 2010 for a removal tool then run the tool.  If noen of that cleans up the PC time to wipe.
good luck
 

Follow the steps of Virus troubleshooting -

http://service1.symantec.com/SUPPORT/ent-security....

If you followed these steps and have uploaded the latest definitions and your AV still does not detect, then try removing this threat with Malware Bytes or Hitman Pro.

http://malwarebytes.org/

http://www.surfright.nl/en/hitmanpro

If I have SEP with current maintenance why should I have to use a third party tool?   I have this same infestation on a PC (second time no less) and SEPwill not find it despite multiple references on other vendors websites.

Just for info, the SAV Corporate 10.1.9 version doesn't detect this rogue virus...

If you have XP Internet Security 2010, then a lot of virus and spyware scanners just don't install or work when this rogue is activated. XP Internet Security 2010 will shut down these scanners such as malware bytes and even has some issues with Norton.

However, what you can try to do is this:

Reboot your computer, and BEFORE XP Internet Security 2010 gets a chance to load, open task manager (ctrl + alt + del).
If you do this after the malware has loaded, then it will most likely close task manager.

Once task manager is up, look for the .exe file for XP Internet Security 2010, which is av.exe
Select that file and hit end process

That should temporarily stop XP Internet Security 2010 and allow you to run whatever virus remover you want.

Hope that helps, for Symantec compatible removal instructions, check manual removal instructions at XP Internet Security 2010

 Find and Delete These XP Internet Security 2010 Files