USB harddrive causes lockup

From: Chris (chn646s_at_smsu.edu)
Date: 10/08/04 

Date: Fri, 8 Oct 2004 12:38:17 -0700

When I plug in my usb harddrive, my computer locks up. It
didn't do this before, but my computer went throught a
rebooting fit where for some reason it just kept
rebooting itself. I'm assuming a file got damaged in all
of the unexpected reboots. Any ideas on what to do?

Its Windows XP. P4 1.8ghz overclocked to about 2.2, 1024
RAM