USB Scan and fix (recommended)

Hi,
I use an Ironkey USB drive. You are meant to lock them before removing or restarting the PC they are attached to. Unfortunately windows crashed while the drive was unlocked and now every time I access the drive windows pops up a dialogue box telling me there might be a problem with the drive (there isn't) and that I should either "Scan and fix" or "Continue without scanning".

If I choose the Scan and fix option it doesn't work. Because of the way these drives are built there doesn't seem to be a way to complete a scan - I run into dismount issues.... And Windows still claims a drive error the next time I use the USB.

If I continue without scanning then Windows eternally pops up the same annoying reminder every single time I use the drive.

The only way I know of to prevent these pop-ups is to reinstall windows. Which seems like overkill.

Windows must store a flag against the drive somewhere (the registry maybe?). Does anybody know where this information is held and how to edit it?

If I use a different (unflagged?) USB the pop-up does not appear; or if I use the (flagged) drive in another machine it doesn't appear. So windows has created some "blacklist" somewhere.

A less radical approach is I might try rolling windows back to a safe point, but this still seems like a lot of work.

I found an article describing what reg entries to delete wiki

Under:

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\DeviceClasses\{53f56307-b6bf-11d0-94f2-00a0c91efb8b}

I found a lot of entries that contained drive names so it was easy to locate and delete the relevant entries. The problem persisted after so I looked under:

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Enum\USB

I found a lot of entries but couldn't determine which related to my USB drive so was afraid to delete anything. I found some relevant named entries under:

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Enum\USBSTOR

But even as administrator was unable to delete any of them. The most promising is:

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\UsbFlags

But again there is no way to determine what keys are valid. Can I safely delete all of these keys?

I tried to restore Windows to an earlier state which did not resolve the problem and corrupted my AV software.