I first noticed I had a problem when Symantec AntiVirus Corporate did not update from the Antivirus Server
I thought I could fix the problem by unloading and reloading the Antivirus but the Windows Installer dialog box came up and just hung.
Went to Windows Update downloaded what looked like a Outlook Express Service Pack, that did not install. I seem to remember the above downloading but not intstalling before.
Went to start Outlook, that hung
Was going to reinstall Office (Repair) but the Windows Installer came up and hung
Note: Cancel does not close the Installer dialog box, you have to use the task manager or reboot.
Tried Registry Mechanic, that found about 180 errors and fixed them, but the same problem exists with Windows Installer.
Downloaded the Windows installer redistributable from Microsoft, the Windows Installer comes up and hangs.
Downloaded the Windows Installer fix utility from Microsoft, but Windows Installer comes up and hangs.
The server is running fine, except that the AV does not update and I have lost the ability to install or remove software that uses Windows Installer.