Also, if you're going to upgrade, at least seriously consider a new PSU. Even the best power supplies degrade and fail. IME a poor (or poorly functioning) PSU is the surest way to kill almost anything in your computer.

Cheadle was brilliant in Boogie Nights, Traffic, Hotel Rwanda, Devil In A Blue Dress, and, actually, anything else I can remember seeing him in. He even managed to make NFL promos dramatic. I recently also noticed he was in the late 80s gang movie Colors, and he was just as good in that, even though he barely had any dialogue.

I would think the simplest and most effective way to do this would be using the command line file association tools - ftype and assoc.

There's a tutorial here for backing them up and restoring them from the command line. I haven't tried it myself, but it seems sound at a glance.