Need Help With Code Still new User :)

Hi VBF :)

I've Trying to make a Folder locker program with user login to get to the part where you lock the folder and its working on the C: drive but not on others drives or USB stick what do i need in code?
And it giving me a windows error when i press exit in my program's browse window and then see picture. And the Error is only cumming if i have locked a file or chosen a file, Its like windows cant find out that the program is being closed.

i have attach the codes i've been using.