New
#61
UltraISO caused Reserved Drive Letter.
OK, finally found the bad boy causeing D: to be locked up and in RESERVE.
UltraISO. for some reason failed to release the Drive letter after using as VDrive.
rebooted and now I have full control back to all Drive letters.
9.3.3.265 has a default setting or make iso drive. which retains drive letter and gives you the FAKE CD Drive.