I would strongly suggest getting the latest portable version from the first forum topic, and then updating to the latest 3.5 patch available from my signature below.
I don't know if that will solve the issue, but you've got nothing to lose by trying it.
I also suggest the portable version in case as a) the store version doesn't get updated all that frequently and b) with the portable install, you can just copy then entire MB directory and move it to any other directory. Place it in c:\MusicBee, or something similar, but -not- in c:\users\...
Lastly - you don't have much space left on your c:\drive. Try to free up some space.