How do I fix my broken Windows Installer service?

My Windows Installer does not work and I can’t install any software on my office PC (Windows 7, 64-bit Ultimate).

When I try to install new software first it pops up a box that says
“Windows Installer

Preparing to install…”

Then it errors out with:
“The Windows Installer Service could not be accessed. This can occur if the Windows Installer is not correctly installed. Contact your support personnel for assistance.”

Any ideas? I’ve searched google for too long, tried to many registry fixes, etc. I’ve verified the service is running. There may be some $$$ or free photos involved if you can fix!

8 thoughts on “How do I fix my broken Windows Installer service?

  1. Just tried those.. no luck 🙁 Thanks for posting, those were new solutions to me. I don’t even have the subfolder they mention under the registry entry, nor the key to change the value. I’m just gonna hire someone from odesk.com to remote in and fix it. I’ve lost hours on this issue and getting nowhere.

  2. Great idea, but too late, don’t have any system restores that old, I’ve been dealing with this for a while. I’ve actually hired someone to fix… so far, nothing. I just barely got my windows set up how I want it, hate to think about reinstalling (just installed this windows about 4 months ago).

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