"Windows Installer could not be accessed"

[Black_Star]

For some reason, Windows Installer isn't working. Whenever I try to install the UT3 demo, I get this message. I tried uninstalling and reinstalling Windows Installer, but I still get the error. Help?

 

[Petie]

When is the last time you ran Windows Update? I know they occasionally update Windows Installer so you can try checking if you have the most recent version, though since you said you uninstalled and reinstalled it, that isn't likely the problem.

Is it just UT3 or can you not install anything?

 

[blinkboy211]

maybe the data is corupt if you have everything updated or there is too much traffic on that download

 

[Black_Star]

I can't install anything new on my computer.