I have 3 seperate drives in my system. I want to dual boot Windows Vista and Windows 7 RC1. Vista is install on the first drive (C) I want to install Windows 7 on the second drive D but there is currently files on the drive (some Videos and music etc). If i choose to install Windows 7 custom install and choose the D drive will it format the drive or wipe any of the files on there? I dont have any means of moving or backing up these files are they take up too much room (a lot of em are in HD format). So all i want to know is will the Win 7 installer delete the exisitng files on the drive? Thanks.