Just saw a post on another thread which totally worked for me:

QUOTE:

"Thanks for responding.. I ultimately called Microsoft... They diagnosed it to a DCOM issue.

It turns out the Registry key HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Ole conflicts with this portion of the install. The rep had me back up (or export) this portion of the Registry, delete the "DefaultAccessPermission" value and associated binary data, and re-run the install.

Worked great.

Afterwards, I added the value back.

"

Hope this helps someone!