Isass.exe

Hello, I have a dell inspiron 6400 with intel core 2 duo processor... problem is that my computer has a process called Isass.exe which is using 100% of my cpu along with another process called fhcdogtv.exe. Every time I try to end the process it comes back.... but the Isass.exe process always shows the message that it is a critical system process and cannot be ended.... I also checked the location of the process and it was at the starting of my C drive.... I cannot remove it and it most probably is a virus... I used a lot of anti spyware softwares like spyhunter and spybot to remove it... it seems they detect it and remove it but it still comes back..... I cant stop it.... Has anyone faced this virus before... And if so can u please tell me a way to remove it.... thanx....

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