Just a thought on my part.
It sounds to me that your grandson is possibly trying to load a programme to a PC., either from a disc or as an internet download.
If that is the case, then he must switch off the PC and then turn off all power to everything ( PC, Router, Speakers, Printer, etc etc) , leave for about ten minutes and then re-connect, prior to re-loading whatever he is trying to feed into the PC or whatever.
I think more information is required from your Grandson as regards what actually he is trying to do, the equipment involved, etc. Perhaps then there will be a better qualified ABer than myself to help in the matter.
Hans.