I use my USB flash drive at work all the time so I know it works fine. Windows 10 used to read it fine, but stopped about a week or so ago. Now when I select it from the file explorer it either says it is not accessible, access denied, or tries to open Ad-Adware. I can reach the non-protected portion sometimes, but it never prompts me for the password to open the files I need. Any thoughts? Thanks.

Note - I've tried changing the drive letter, but that didn't help. Same things occur. Basically, the unlock message never appears. I also tried it in different USB ports.