Did your Internet Explorer title bar shown this "Hacked by Pokemon" ? search your computer this file " bha.dll.vbs ", if exist your computer may be infected.
-Infected every of your partition including removable drive.This is because the script was written to generate bha.vbs.dll and autorun.inf.
-Spread via removable drive such as pendrive or other storage device because of its capability to generate dll file using vbs script.
If so, go to this link http://tweak-everything.blogspot.com/search/label/virus%20info ,may be can help or google "bha.dll.vbs "