I suppose you could remove it using Stinger. Or you can use Malwarebytes Antimalware, SUPERAntispyware or Hitman Pro to remove XP Home Security 2012 malware. Detailed removal instructions:
If you have a clean computer, you should go with the first link. And if you don't, follow the second one.
Tools need to remove the rogue application.
1. FixNCR.reg http://download.bleepingcomputer.com/reg/FixNCR.reg
2. Rkill (optional) http://www.bleepingcomputer.com/download/anti-virus/rkill
3. Malwarebytes Antimalware, SUPERAntispyware, Hitman Pro or any other anti-malware software.
Note: if you got a box saying "which program do you want to use to open this file", please run FixNCR.reg.