This is a Microsoft problem.

Windows things that a drive, i.e. an USB stick is missing.

Similar situation is answered here:

http://social.answers.microsoft.com/Forums/en-US/w7repair/thread/7a158e14-6a56-4bfd-b1b5-796c3ccea3b0


This is what most users had to do to fix the problem:

1) Open Windows Explorer

2) Right click on Computer and select Manage

3) On the left panel, select Disk Management

4) Right click on Disk 2

5) Select Change Drive Letter and Paths...

6) Select Change...

7) Assign an available drive letter greater than G: