Well I was just Googling. I have no personal experience here.
You might browse your Event Viewer and see if any errors show up.
Event Viewer
--------------------------------------------------
Check your
Event Viewer via
Administrative Tools.
Open the
System as well as
Application tabs and look for red
X errors that coincide with your problem. Details here:
How to view and manage event logs in Event Viewer in Windows XP
Basic information on Event Viewer errors can be found here:
EventID.Net
Also any other errors you receive please post them verbatim.