Hello. I found the following on this link:
http://aumha.net/viewtopic.php?t=19576&;
"Found an instance similar to mine: i.e. had used Windows Live Registry
Cleaner before downloading the Kb916521 update.
Advice from Robin Walker [MVP] was to find the backup done by the
aforementiond programme at:
"Documents and Settings|<user>\ApplicationData\Windows Live Safety
Centre\Backup. I then double clicked the .reg file, closed everything down,
manually downloaded and installed the update.
Now everything's back to normal, and update is succefully installed. "
I tried this and it also solved my problem. If you have used Windows Live
Safety Center to clean your registry, that could be your problem, too. Best
of luck.
hockman44