Thanks for all the suggestions so far!
I have not installed Win10 on the machine. It currently is a Win7 Home Premium that I try to upgrade to Win10 primarily through the install disc from Microsoft.
It did not start installing Win10 and when I return to the currently installed Win7 it is...
Tried via USB, same behaviour. Can't burn a new disc unfortunately. The current windows installation has become so unresponsive I can't really do much from within.
I am currently trying to overwrite my old PC to hand it to my girlfriend with a clean slate.
It's currently a win7 home premium.
I changed boot priority to DVD over HDD, insert Win10 disc, start PC. When prompted to press any key the win10 logo comes up and after a few minutes I am told that a...