I am doing a full install of Windows 7 on a Dell Studio XPS 1640 laptop which has Vista installed currently. When I get to the window which says, "Where do you want to install Windows?" it offers three choices. Disk 0 Partition 1 OEM (Reserved) with 150 MB total size 140 MB free space Disk 0 Partition 2: RECOVERY (D: with 15.0 GB total size 7.5 primary Disk 0 Partition 3: OS (C: I am assuming Partition 3: OS (C: is the proper place to install, but will the new install eliminate the other partitions? Do I need these partitions?