Windows Installer 4.0 is not working in VISTA

Something corrupted the installer program on my VISTA computer. Now every
time I try to install or uninstall I get "The Windows Installer could not be
accessed. This can occur if the Windows Installer is not correctly installed.
Contact your support personnel for assistance."

How do I re-install Windows Installer version 4.xx? I've tried using the
msiccu2.exe program that HP support suggested. It won't load because of the
same error. I've tried dotnetfx35.exe and it doesn't finish installing. Both
of these suggestions came from HP Help chat.

Microsoft does NOT have a redistributable windows installer for VISTA.

Any suggestions??

Thanks.
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