Thank you, thank you, thank you to Barry and Guy. I don't know how you acquire the knowledge about the "innards" of these machines, but I'm so grateful you have it! Guy's fixes both worked perfectly. I was able to optimize my hard drive and it truly does seem peppier now. Booting from the CD works fine with USB devices disconnected (wonder how long it would have taken me to think of that?). Explorer quits instantly, with no freezes and I'm one happy camper. Barry, your suggestion to reinstall would have been my last resort, but I would happily have done it had the other ideas not worked. Again, I'm so glad this list is here. As a user more on the graphics side than the techno side, I don't know how I would have figured all this out on my own. Thanks ... again. Debbi