Win2K registry question

I recently wrote about a "clicking" sound on my Dell pc. It sounds like a relay that is opening and closing. Found this file: userenv.log[/B] and wonder if it points to my problem.

USERENV(e8.e4) 10:46:13:403 UnloadUserProfile: received a NULL hProfile.
USERENV(cc.b4) 13:12:39:894 MyRegUnLoadKey: Hive unload for (MY REGISTRY USER PROFILE BLANKED FOR SECURITY ON THIS FORUM) failed due to open registry key. Windows will try unloading the registry hive once a second for the next 60 seconds (max).
USERENV(cc.b4) 13:13:40:251 MyRegUnLoadKey: Windows was not able to unload the registry hive.
USERENV(cc.b4) 13:13:40:251 MyRegUnLoadKey: Failed to unmount hive 5
USERENV(cc.b4) 13:13:40:251 UnloadUserProfile: Didn't unload user profile <err = 5>
USERENV(cc.b4) 13:13:40:251 DumpOpenRegistryHandle: 9 user registry Handles leaked from \Registry\User\(MY REGISTRY USER PROFILE BLANKED FOR SECURITY ON THIS FORUM)


Does anyone know if this is a problem that I should fix and if so, how? Have run Norton Disk Clean and nothing shows up. Have run Spybot and it comes back clean. PC runs slow and pauses when this clicking starts.