Hi,
I have a 6-in-1 media card reader which I plugged in/installed yesterday w/o using the installation disk (was feeling lazy and running on Vista, know the drivers will be auto installed). Started getting the error message every few seconds. Did not find any file as specified in earliest posts - was about to do a system rollback. Nothing suspicious running in the startup programs. Installed driver from CD to see if it fixed it - same problem.
Found out that the issue was my Photoshop Elements was trying to synch to the drive (I had downloaded photos yesterday from the media card) for a reason I don't understand and, even when the media card reader and media card were plugged in, I guess it couldn't find the necessary files though they were not deleted. I went into Photoshop, into backup settings and messed around. I"m sorry to be so vague. I believe I "reconnected" (helped the program find the new location) to some photos to file paths which had changed slightly after doing some edits yesterday. But when I closed it and restarted today after these small modifications, I had no problem any longer! I think Photoshop was just stuck looking for these files, and I had auto-synch for the program on without realizing it.
So...though this is probably not super helpful, maybe someone else had the error message for the same reason? It saved me a lot of modification to my new computer.
Good luck...it was driving me crazy and thank you tech support/peeps for helping me associate it with my card reader!