I am using the computer since last two years and using the following specification that is using windows Vista home premium 32-bit with Intel Core 2 Quad Q6600 processor and also having the 3 gigs RAM. The problem is that I cannot custom install via DVD for together the 32 and 64 bit edition when I can boot from the disc occasionally the startup won't request to boot as of disc, the start-up commence usually then pronounce: "Load Driver a necessary CD/DVD drive. Device driver is absent." Which occurs after the "No device drivers be initiate ensure that the setting up medium enclose the accurate drivers". I am able to put in windows 7 32-bit by means of upgrade, other than I desire to practice set up to the 64-bit OS. Please help me.