Sounds more like a Windows filesystem issue than anything Maximizer related per se.
But I would never try to copy maximizer files directly. I might copy a folder containing backup files, but they're compressed and designed to be copied.
So, if you can use the database from the flash drive, then:
1. make a new folder on your desktop named "maxbackup" or something
2. Backup the database to the new folder
3. Restore to a folder on your hard drive where you want the database (clicking "yes" when it points out that you're restoring to a different location).
Bonne chance.