Download the Program Install and Uninstall Troubleshooter from Microsoft’s official download page. Click on the downloaded file, and the troubleshooter will open.

The Program Install and Uninstall troubleshooter helps you automatically repair issues when you’re blocked from installing or removing programs. It also fixes corrupted registry keys.

I'm working on a PE2650, which did have memory errors identical to Padster's thread. The memory didn't seem to cause problems for a while, but maybe it did recently: now there's a program that's ...