You might also want to give this a try... Start | Run | Type regedit, and click OK | Expand the following branch in the registry:
HKEY_LOCAL_MACHINE | SYSTEM | CurrentControlSet | Services | nvata
In the RH pane right-click and select New--> DWORD Value | Give the new DWORD a Value name of DisableRemovable | Right click the DWORD and select "Modify" | In the "Edit DWORD" window that opens, type 1 in the Value data field and click OK | Reboot.