If LW won't stay open, try the fixes below.
I can't run the program...

It's a bit hard to see what's going on, on the youtube screen (even when zooming in). Was it the firewall setup screen (from the setup wizard) which was popping up?

If the fixes in the post above don't help, could you post with details about what screens are popping up & also with your system details?
System details - help us to help you -> Provide these details when you post!!!(click on link)