conhost.exe infected. (backdoored)

Hi all..


Well,i dont know if this is normal but why is there always two conhost.exe
And i mean its always running..

So i logon to my computer check task mananger and there are two conhost.exe running.

So i then check WinPatrol and i go to active tasks and its running there also..But it should not be..Because it should only be like your webbrowser and stuff?..

So i killed the process and deleted the conhost.exe but then the cmd would not work so i put it back in fresh again from my windows 7 disc..But still the same problem..

I have runned full scans with
Avira
KAS IS 2011
Malwarebytes' Anti-Malware
Spy-Bot

May someone please please help?

Thank You.