I am attempting to custom install windows 7 64 bit on a computer currently running windows vista 32 bit. I created my installation disk (3 attempts) from an ISO file using 2 different 3rd party programs to create a bootable disk. I also changed the BIOS to boot from DVD first. I get to the prompt to "press any key to boot from cd/dvd" but it does not appear my keystroke is recognized. The computer continues on to boot from the hard drive. Please help!