Every time I try to install something using windows installer, I get the "preparing to install" screen and then it says that windows installer couldn't be accessed. I'm not running in safe mode, and I didn't do anything to change this. I looked online and it said to go into the registry and check the msiexec file to make sure its in the system folder, and it is. I've tried re installing and even though it says it successfully reinstalled, it still wont work. Please help!