Virtual Memory Insufficient After Update?

My son has a problem on his computer. I think it started when he downloaded the last big Microsoft update - the one that was being talked about so much recently. It blocks his computer when it occurs. I have to translate the message he receives on the screen from French, so I hope you will still understand. The message (translated) says: "Windows- Minimal virtual memory insufficient. Your system is lacking virtual memory. Windows augments (increases?) the size of your pagination file of the virtual memory. During this operation, requests for memory for certain applications can be refused. For more information, consult Help". But we can't consult help. We can't do anything. The computer kind of get gets bocked and has to be rebooted all the time. This can occur any time. When he's playing games it shoots him off back to the Windows main page and sometimes he needs to reboot to get back on. It also occurs when he's on the internet. When he's on the internet, he can't get back on and needs to reboot most of the time.