|You can try the following|
1.Go to command prompt and type that drive name assigning for removable device. for example (pendrive in G:)
2. Type attrib *.*,now it shows the hidden attrib files.
3. For example Auto run.inf is present.Type attrib autorun.inf -s -h -r -a
4. Now the Autorun.inf is free from hidden,then simply type del autorun.inf.
5. Now it removes from your Removable device,Likewise the hidden files are unhide to remove easily.
I hope it helps for U.............