Where is my USB memory stick?

A customer says that a USB flash memory stick works fine when he’s logged into other computers but not from his primary workstation. Where’s the best place to start troubleshooting this problem?

A) Check the Device Manager on the primary workstation.

B) Look at the Event Log on the primary workstation.

C) Check the user permissions to see if he can use USB ports.

D) Examine the Task Manager to see if there are conflicts with another running application.