I just downloaded the latest Adobe Acrobat Reader 8. After it finishes
processing during installation, I click run and get this popup:

Windows Installer
The Temp folder is on a drive that is full or is inaccessible. Free up
space on the drive or verify that you have write permission on the Temp
folder.

All of my temp environment variables point to my C drive. I'm logged in as
Administrator and UAC is turned off.

Any ideas?

Thanks,
Brett