I have a Dell 1100 with a P4, 1.5 gb DDR3200, ATI Radeon 256 mb Video card, 80 gb harddrive. I tried running Win7 SR on it got everything working but did not like the results. Since the SR was set to expire soon, I decided to reinstall Win XP home. Everything seems to run ok except XP can't see an external hard drive. When I plug in and turn on the external drive, I get a new hardware found, installing hardware blurb then nothing. When I open Device Manager I see unknown device with no driver installed. Uninstalling device and letting XP find it again doesn't help. all my trouble shooting efforts did not help. Can anyone point me in the right direction?