"sfc /scannow" may not work as it should cuz of that key

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Setup
SourcePath=

So make sure that "SourcePath" including path to your CD driver.
t.ex.
SourcePath=E:\

you also can get try this:
ftp://ftp.drweb.com/pub/drweb/cureit
download "cureit.exe" or "drweb-cureit.exe" (them are same)
and run, it can remove both spyware and viruses, but look in setting too...
that tool updates daily so you not need to update it, however that option also not working.... in that version....