Try the Method 1,2,3,4 presented in the following MSKB article:
Q822798 - "You cannot install some updates or programs"
Trying to unweave, unwind, unravel
And piece together the past and the future,
T. S. Eliot
Every time I try to install SP2 I get this error message:
"Setup could not verify of the file Update.inf. Make sure the Cryptographic service is running on this computer."
I cannot find anything on MS that specifically addresses this problem. Does anyone have a solution?