this is the solution for XP
THIS IS THE SOLUTION FOR XP. I dont know if it works for vista or 7.
YOU DONT HAVE TO LOOSE YOUR FILES FORMATTING THE DISK DOES NOT SHOW IN MY COMPUTER
1. click start and then run.
2. in the open box, type regedit and then cklick ok.
3. in the navigation pane, locate and then click the following registry subkeys (first-second-third-etc) until you see in the right pane disk drives.
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Class\{4D36E965-
E325-11CE-BFC1-08002BE10318}
4. in the right pane, click UpperFilters.
Note. You may also see an UpperFilters.bak registry entry. You dont have to remove this entry. Click UpperFilters only. If you dont see the UpperFilters registry entry, you still might have to remove the LowerFilters registry entry. To do this, go to step 7.
5. On the Edit menu, click Delete.
6. When you are prompted to confirm the deletion, click Yes.
7. In the right pane, click LowerFilters.
Note If you dont see the LowerFilters registry entry, unfortunately this content cannot help you any further. Go to the the "Next Steps" section for information about how you can find more solutions or more help on the Microsoft Web Site.
8. On the Edit menu, click Delete.
9. When you are promptefd to confirm the deletion, click Yes.
10. Exit the Registry Editor.
11. Restart the computer.
12. First DELETE the UpperFilters and if this doesnt work after restart then you might have to DELETE the LowerFilters.
Nik The Greek