Hi there and welcome
I want you to install VLC again on the problem computer please
Go to Start, Control Panel, Add/ Remove Programs
Choose VLC and uninstall it and restart the computer
The download and install it again from my link below and tell me if it is now working
I can also do these steps for you, and have made a request via Additional Services. This is optional, and if you choose to do this, I can, with your permission, remote into your computer while you watch and do all these steps (and deal with any problems that arise during them) for you. Or if you do not choose to take this service, we can continue here. This is no problem at all. Just let me know please.
Else let me know the results.