linux and windows 7

its not saying windows 8 upper. this is talking windows 7 lower ver with linux today. presume youll already know linux faster on gpt. but windows 7 wont. win 7 just only need mbr , wich is you must descredit linux from gpt to mbr to. its wasted power.  .. but as you know to, there is virtual box right? i try to installing .... but amazingly still virtual hdd .vid vbox win7 recognize as gpt and no chance to using win7 wheter virtual or real machines. virtual box kind of disapointed, but its will the same at vmware to. gpt host will stayin gpt event on virtual. im waiting maybe somebody fixing this problem