Recently, I have found that when I am trying to run a program that integrates with QuickBooks, an error pops up that say's a close proximity to "There is no Disk in the Drive" or "Server Busy".
This is a fix that might possibly work if the following exists on your machine.
First, determine if you have a process running on your machine that is called, "CSRSS.EXE", a Microsoft Client Server Subsystem. If it does, it is probably the culprit.
Here is how to fix it:
Go into the system registry: at the command prompt, type, "Regedit".