Then you’ve got to switch to the Process Explorer! I was having some problems with undocking my office Lenovo notebook from the docking station because Windows insisted that my dvd drive was in use when I was very sure that was not the case because there was no DVD disc in the drive at all!
Suspecting that it was a problem with an errant process, I downloaded and launched Process Explorer and found the culprit quickly. Just by searching for the “cdrom” handle, I found out that it was (tada!) Microsoft Search Indexer that was causing me grief. Turning off the service and disallowing it from starting automatically solved my problems.