Broadband drop-out
I've just bought a new computer (Windows 8.1) and when I switch it on, my router drops out and prevents any of my devices connecting with it. (I've watched the router lights turn red as soon as the computer logs on). My old computer also did this towards the end of it's life and I thought buying a new one would solve this problem. I've got a brand new router (supplied by the telephone company) and I'm now on an optic fibre link so was expecting great things. As soon as I switch it off - the router shows all 'greens' and my other devices connect.
Any ideas please ?