LEXAR MICROSD when i first got my lexar sd memory card it worked. Then i formatted it on accident and when i plug it in to the computer i get this error (Windows Media Player cannot find the file. If you are trying to play, burn, or sync an item that is in your library, the item might point to a file that has been moved, renamed, or deleted) and i cant sync any songs to it now. What do i do

Do you remember what the name of the card was before you reformated it? Do you have the files that were on there before the reformat?
Windows Media Player is probably just looking at it as if it were another piece of media. There is no distiction between removable and hard disk. Now that that disk has been archived in Windows Media Player and it's directory structure cataloged it is looking for that same setup.
Recreating the volume as it was, might fix the problem but you will loose sorta the functionality of a removable media card.