After pressing start i got:
Wow, this was easy. But then i got:
"Your PC needs to be repaired
This operating system uses the Physical Address Extension feature to support systems with more than 4 GB of RAM. You'll need to use a PC with a compatible processor to run the operating system"
OK. After checking the processor settings i found:
Error Code: 0x0000005D
Some hints talk about NX or SSE2. But NX is enabled (together with PAE) and SSE2 is supported by nearly every processor.
But there are many posts out there with the same problem: answers.microsoft.com
In my opinion there is one processor check implemented by microsoft, which is to strict...
I searched for a list of supported processors for windows 8, but i found nothing.