You can try...
Start/Run...type devmgmt.msc and hit Enter. This should get you into Device Manager.
Do you see any yellow or red markings by anything? If so, these are indicative of a perceived problem with hardware installation.
You can also go into Disk Management and see if your drive is listed there, probably the last item reflected in the lower screen. Start/Run...type diskmgmt.msc and hit Enter.
If the drive is reflected in Disk Management, then you should try the following registry edit: Upper & Lower Filters - http://delltrain.wordpress.com/2008/07/15/...d-lower-filter/
As with all registry edits...it is important that you backup the registry first. If something goes wrong while a user is working in the registry, the system might be made dysfunctional...backing up the registry before proceeding with any registry edit...protects against such.
A suggested tool for easy registry backup: ERUNT Registry Backup Tool - http://www.snapfiles.com/get/erunt.html
. Once the backup is made, follow the instuctions for deleting the upper/lower filters as provided in the Delltrain link.