Process Explorer is a very valuable tool for t-shooting, as are a few other of the SysInternals tools, I couldn't do without them these days.
It's too bad that most of the newbies that come here looking for help, probably don't know how to use these tools properly or they could make our job of figuring out their problems much easier...
But then again...that's why they're called Newbies/n00b's/@$#!^&'s...

(LOL)
But even with all the tools available, Windoze is just so darn complex that it's still sometimes impossible for an x-pert type person to find out just what the HE(!!) went wrong, so all you noobs out there take heart in that.