You may get a user complaining that when they open Windows Explorer they get a message stating "Documents.library-ms" is no longer working. This library can be safely deleted from your computer.
This appears to be a corruption to one of the default library folders used to collate folder locations together in Windows 7 and 8. Happily it is easily fixed.
Open Windows Explorer, Right click on the Library in question, right click on Libraries and select restore default libraries.
You should find that the library has been repaired and you are up and running again.