Also:
Is this a new problem? Were things working OK previously? Any new hardware or software?
Look in your Event viewer: rt. click My Computer then click Manage then Event Viewer.
Or: Administrative Tools/Event Viewer or Start/Run/ eventvwr
Open the system as well as the application tabs & look for red
X errors. Click error line for details.
Post back the source & event id & Description especially of errors that seem to coincide with this issue.
Also check the Information lines that might coincide with this issue.
How to view and manage event logs in Event Viewer in Windows XP
The CMOS error is outside of XP therefore either a hardware issue or the BIOS.
If you get this message again what is the verbatim message?
Is this an old computer? Make and model?