What causes your computer to not respond?

could be a lot of things. do a disc defrag, disc cleanup download and run cc cleaner it free and will clean up all kinds of junk that is slowing you down

if you're running too many application at once in a low spec computer (memory, VGA, processor), it could cause your computer to stop responding. or it can be because of a virus.

you might want to upgrade your computer's components and install and update a decent antivirus on your computer.

hope this helps.

Any version of Microsoft Windows will do it.