When I open certain pdf files by double-clicking them, Acrobat Reader presents four error boxes, "There is no disk in the drive. Please insert a disk into drive X:" where X is the letter of my card reader drives (M-L-K-J, four errors, one for each card reader). It doesn't do this for every pdf, and it does show the document after I dismiss the four error boxes. I have uninstalled reader, rebooted and reinstalled, but the problem persists.
I'd appreciate any thoughts on how to track down and eliminate the cause of this error.