Winxp some way to tell what program is accessing a drive

[DragonfireKP]

Hello,
Is there some way in WinXP to tell what program is holding on to my external USB drive so I can close it and remove the drive? I can't be rebooting every time I need to take it to another PC. Even when I close down all applications, it still won't release. It's a Western Digital, and I've tried closing the WDDMStatus.exe, but that's not the problem. I need to find out exactly what's holding it so I can fix the problem. I've tried dong a "full stop" on the drive, but the problem persists. I'm suspicious of the Norton Security Suite, but I want to be sure that I'm getting the right program. Thanks.

 

[Chicano]

Autoruns \ Explorer tab
http://www.filehippo.com/download_autoruns/

Unlocker
http://www.filehippo.com/download_unlocker/
Right click on the drive letter shows a list of programs currently with a handle/hold on the drive. (Close Unlocker with the upper right X to prevent any action)

If you haven't disabled System Restore on the external drive, that would probably be one of the programs with a hold/handle on to the drive... Explorer.exe and svchost.exe would also be included.