It sounds like it may be an association issue. See if downloading and merging the exe and lnk (LNK) options in the tutorial below may be able to fix this for you.
Press Ctrl + Alt and Delete keys all together > select Task Manager > at the top, click Processes > at the left side, find explorer.exe > right click at it, click End Process > at the top, click Applications > click New task... > in the Open box, type explorer.exe > click OK when done.