At first I was considering running a dual boot system with Windows Xp Professional 64 bit and Windows 7, but have since decided to run Windows 7 as my main OS. This computer is a new Core i7 build with 6 Gb Ram. I have already backed up the VERY few files I have on my computer, since its a new build I don't have many, so my question(s) is...would I need to do a fresh format of my hard drive by right clicking my C: drive and selecting format or do I just pop the Windows 7 disk in and allow it to do its thing? Will the install disk for Windows 7 give me the option to format my disk drive? Also, I have tried to format my disk by right clicking and selecting format, but I got an error stating to close anything that may have the contents of my hard drive open?