Found the info from Vikinginterworks whom manufactured mine. May be of some use.
From your responses, the USB drive is actually working and is still usable. What happened is that the USB drive usually defaults itself as either drive E, F, G, or H. However, you have so many different drive letters on both your home and work PCs, that your systems are not automatically assigning the USB drive due to overlapping of drive letters. We will need to change the path and drive letter for the USB drive in order for you to use it.
To assign a new drive letter for your USB Drive, please follow the instructions below:
1. Right Click on "My Computer" and Choose "Manage" to access Computer Management
2. Under "Storage", Click on "Disk Management"
3. Look at the bottom grey section of the screen.
4. Look for the "Disk#" that possibly says "Removable" and contains the amount of MB for the USB drive you have. In this case, the amount is anywhere between 244MB to 256MB.
5. To the right of the Disk# you found, Right click on the white area and Choose "Change Drive Letter and Path"
6. In the "Change Drive letter and Path" screen, you will click on "Edit"
7. Assign a drive letter using the pull-down menu provided. Please choose a letter that is not being used by any of the PCs.
8. Once you have chosen the drive letter, Click "OK" to complete the change, then exit all your screens.
9. Open "My Computer" to view all your drives. You should now see the new drive letter you chose for the USB Drive.
10. The USB drive can now be accessed and used as normal.
Please note: Computers may vary and this change might not default after removing the USB and pluggin it in again to your PC. You may have to follow this procedure again if your computer does not keep the new drive letter.
There's another area for you to check on the USB drive.
1. Plug in the drive, wait about 30 seconds to allow the system to install it.
2. Right Click on "My Computer" and Choose "Properties"
3. Click on "Hardware" tab
4. Click on "Device Manager" button
5. From here, there is a lising of different devices on your computer. The USB drive should be located under "Disk Drives" or "Other Devices".
6. Highlight the Viking USB drive.
7. Goto to "Action" at top and click on "Uninstall" or "Remove".
8. Then go to action again and "Scan for hardware changes"
9. Then Check "my Computer" again for the drive letter. If the drive letter is still not listed, try the instructions on changing drive letter path once again.
Another recommendation is to try plugging this USB drive onto someone else's computer. Another computer that has Windows 2000, different than XP that you have and the computer should have less drive letters to start with. There is a better chance that you will be able to at least get your files from this USB drive this way.
Really hope it helps.