Windows Installer corrupted?

My Windows Installer hasn't been working for a while now. When I try to install anything, I get the following error message:

"Windows Installer Service could not be accessed. This can occur
if you are running Windows in safe mode or if Windows Installer is not
correctly installed"

I've tried everything here: http://support.microsoft.com/kb/315346

However, something strange I noticed when I was trying to reinstall Windows Installer is that no files were added, at least not in c:\WINDOWS\system32, which is where the previous installation was located.

Anyone know how I can fix this?

 

try Dial-a fix:http://www.majorgeeks.com/download4899.html

 

Testing it now. I'll get back to you on whether it works or not.

EDIT: Didn't work

Any more suggestions?

 

I checked, and they're both running.