I experienced a server install problem. It was a fresh install on a 64-bit windows 7 premium OS box with plenty of hardware (8GB RAM). I tried to uninstall it and it hung for an hour in the backup process. I ended the process and tried again and got the same result. I tried it again but only ended the tabadmin.exe process and it uninstalled correctly.
I tried to install it again and it failed again. Not sure why...