Here is the tutorial that I used:
Under Vista:
1. Open Notepad and copy the following
[HKEY_CURRENT_USER\Software\ Microsoft\ Windows\ CurrentVersion\ Explorer\ Advanced] “EncryptionContextMenu”=dword:00000001
2. Save the file as USBNoWrite_Vista.reg
3. If you double click the file(and using Vista you will see the UAC prompt. Click Continue) click Yes to the confirmation box that appears.
4. Restart the computer for this setting to take affect
Now, the next time someone tries to send files to a USB drive, they will see a message saying
” The Disk is write-proteced.
Remove the write-protection or use another disk
Note: System Administrators can also configure this setting to use Group Policy. So block of all USB writing permission to say a group of employees.
NOTE: Remove the spaces that I added to the HKEY statement above. I needed to add them in order to avoid the URL assumption made by the bulletin board software.
Here is a tutorial for XP SP 2:
Disabling USB Drives