Aengus

Upgraded to win 10 and then my wifi dongle crashed win 10

depending on what dongle you're using W10 will install it's own driver for it but with that it means you'll have the dongle driver and W10 driver conflicting hence it not working. Other known reason for WiFi not connecting which i discovered is any type of internet security suite installed. If you have any third party programs like that it will stop your internet because W10 comes with its own installed internet security so they conflict knocking out the internet. I'd also rec...

I'd also recommend checking your HDD isn't running at 100% as well that's another known problem with W10