Just curious - any one google it?
Turns out this is a known issue - and appears to be attributed to the deep folder structure for the temp file.
The solution is to change the temp file to a different location so it doesn't have to dig deep into folders.
The installshield page covering this is found here - with instructions on the fix:
http://consumer.installshield.com/kb.asp?id=q110648%20
I would try that also.