Numerous people have reported the W7 "feature" that causes certain types of icons on the Windows Desktop to disappear over time.   It turns out there is a background service that periodically scans the computer for things it determines are deleterious to a computer that runs shipshape and in Bristol fashion.  Icons that represent shortcuts to a central server, especially a central server that is temporarily unreachable, are erased.   This is deemed proper by the powers that be.   How can that reasoning pass muster?   I have a folder that originates in my  account's user Desktop folder thatI keep for copying back to the actual Desktop each time I discover my handy-dandy shortcuts have gone missing.    Perhaps the policy that the "feature" implements deserves a review.