When i press to symantic antivirus to scan. it tells me "couldnt start scan. scan engine return

what can i do to make symantec antivirus to scan..

how do i remove the following virus which is in

C:\windows\system32\ssttr.dll

it is trojan.virtumonde

i used xoftspyse and spyware doctor and spyware terminator and avgi antispyware .... none worked

When i press to symantic antivirus to scan. it tells me "couldnt start scan. scan engine returned to 0*2???microsoft office

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