Wait, aparntly Tweak UI may fix the problem, have a look at this software, just reasign the drive letter using this or disk manager
Totalidea Software :: Downloads :: Tweak Windows 7 - Tweak Windows Vista - Tweak-7 - Tweak7 - TweakVI - Tweak-Vista - TweakVista - TweakXP - Tweak-XP - Tweak XP - TweakUI - Outlook Backup - Outlook Notes - FireTune
I dont know if this will work for you but looking on the web I came accross someone who had a similar problem they fixed it as follows.
They installed Tweak UI and then
She I was able to get the drive recognized using "Tweak UI", clicking on My Computer, Drives,and check marking Drive F. It did the trick.
Hope this helps
Kindest Regards Tony B." (Kioskea.net)