Installating Openafs on Windows fails... (64Bit)

If you have to install a msi-installer on a windows 64Bit machine, it is possible that this installer just fail silently. After you enable logging (look at this posting) this is a possible error message:

MSI (s) (60:CC) [20:34:54:265]: Product: OpenAFS for Windows (64-bit) -- Error 1719. The Windows Installer Service could not be accessed. This can occur if you are running Windows in safe mode, or if the Windows Installer is not correctly installed. Contact your support personnel for assistance.

This is an indication, that your msi-installer is configured in 32-bit mode and not in 64-bit mode but the installable needs 64-bit mode.
How can you change this? Here one answer found on Aaron Stebner's WebLog:

1. Click on the Start menu, choose Run, type cmd and click OK
2. Run %windir%\system32\msiexec.exe /unregister
3. Run %windir%\syswow64\msiexec.exe /unregister
4. Run %windir%\system32\msiexec.exe /regserver
5. Run %windir%\syswow64\msiexec.exe /regserver
6. Restart the computer

After that the installation will finish (hopefully) without an error ;-)