Hi Paultpa,
I read your previous Topic where you received help from the expert, Jintan, only up to the point of learning that you are running XP Professional SP3. had one or more infections, had difficulty with an older version of AVG antivirus, had Threatfire installed, and had several system warning conflicts related to AVG, Iomega products, and a few more conflicts.
It always helps when the Topic starter gives basic information about their machine, their operating system, any suspect software, the particular feature that is causing the identified problem (for instance the Brand and Model of USB stick causing the difficulty) and previous things you may have already tried to resolve the problem.
And most importantly, it would help to know if the saved information on that USB device is vulnerable…. meaning you do not want to loose the information and have not saved it anywhere else, and therefore must work to retrieve the information from the USB stick device without further risk of loose.
For instance, some "solutions" may involve procedures that would put your saved information at risk.
Such as Formating the device to restore its functionality, but at cost of loosing all the saved information on it.
I may necessarily go back and read your complete malware removal thread to better understand and gleen some clues regarding what may be going on, but for now, it could still help for you to provide some of the above basics to fill in our starting point.
For instance, some USB memory sticks have a physical switch which can be clicked to "lock" / "write protect" the device.
If yours is one of them, have you checked that feature?
Sometimes it is not the USB memory stick device itself, but rather the USB port into which it is plugged.
Have you tried the USB stick in other USB ports on this machine?
Have you tried the USB stick with another known-good machine?
Have you cleared the USB controllers and allowed them to be freshly installed?
— how-to information here:
http://support.microsoft.com/kb/817900
Is Threatfire still installed on that machine?
If so, it can be extremely agressive and prevent even some normal routine computer functions that might include your present problem.
If so, you might consider completely uninstalling Threatfire.
Have you worked in the machine's Registry to assure that no control set policy is causing USB devices to be "write protected"?
Have you created recent Restore Points and separately backed up your registry?
If none of the above mentioned basics apply in your situation, then we will probably be heading to the Registry to at least take a look and possibly to effect a solution.
But I would not want to venture into Registry work with you, unless you already have a competent Registry Backup, created by a good tool such as ERUNT.
Let me know if you have already backed up your Registry?
Have you attempted to access and copy/retrieve the files on that USB Stick via Command Prompt (the DOS-like utility) that would allow you to access Directories, folders and files outside of the usual Windows tools?
Have you attempted any repair/retrieval via SAFE Mode?
I realize I've asked a bunch of questions and hardly offered any suggestions, but I do need the requested information in order to offer the best informed suggestions for solution that you deserve.
Best Regards,
Doug