The It department may have disabled your ability to see the contents of a flash drive. Although I don't know the way they have done this (there are several ways) you could try this registry edit. Simply copy the text below to notepad, change the "e:" to the letter of your USB drive, and save as Fix.ref. Then double click on the file fix.ref and import to the registry.
Windows Registry Editor Version 5.00
If the above does not work then no harm will have been done and you could try the system policy editor.