You can repair Windows AntiSpyware using Add or Remove
Programs in Control Panel. Click Microsoft AntiSpyware
and click Change. Click Next, and then click Updªte.
OR
Some solutions here from Tom Emmelot:
Uninstall from ADD/REM,
Delete in C:/windows/Program files, MSAS subfolders and
the MSAS folder; and delete in
C:\windows\system32 the following files:
GCCollection.dll
hashlib.dll
gcUnCompress.dll