|scvhost.exe is a virus.|
Svchost.exe the legitimate programme of which you can have many instances running.
Scvhost.exe has been around for a along time, so long that nearly all anti-virus applications have got it well beaten.
I suspect you are not running and AV application in which case I suggest you install AVG free.
I would also upgrade to SP3 while you are at it but get rid of any viruses first..