thanks a lot lasvegaswireman for your contribute!
the other day I was able to put windows 7 on by enabling legacy for the UEFI in bios, but then I had problems with some drivers, so I switched back to windows 8 for the moment in order to be able to use the pc at least.
Today I've tried again to install win 7 but I encountered a problem during installation: "the selected disk is of the GPT partition style".
what's going on now?
There's always something with this win8-new generation computers..
Any idea?
Thanks a lot guys