Symptom: When installing VMware 4.5.1, my system has hung during installing VMware Authorization service. No way but to reset the system. But, this leads to failure of uninstallation.
If you try a clean install of 4.0.x it works fine on the same system.
The fix appears to be that you must have a swap file to complete the installation:-)
As soon as i enabled the swap file, i was able to complete the installation.