One commom solution to that problem is to change the removable drive letter. To do that follow this steps ( be sure that the drive is plugged in)
1. Log on as Administrator.
2. Go to Start-> Control Panel and click Performance and Maintenance.
3. Go to Administrative Tools double-click Computer Management and click Disk Management.
4.Right-click the the removable drive letter and then click Change Drive Letter and Paths.
5.Click Change.
6.Click Assign the following drive letter and select the drive letter that you want to use and click OK.
7.Click Yes.