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...