Disk Management???

I have a 120 gig hard drive installed in windows xp. Only 32 gig are showing as being used. The rest is showing as unpartioned space. When I go into disk managemnt to create it into a partion I get this error.

“The disk
configuration operation did not complete. Check the system event log for
more information on the error. Verify the status of your storage devices
before retrying. If that does not solve the problem, close the disk
management console, then restart disk management or restart the computer.”