I'm trying to install windows vista on my laptop. On the page that asks where do I want to install Windows, it lists Disk 0 Unallocated Space 74.5 GB total size 74.5 GB free space. I selected new which opened up a box that says Size: 76319 MB, w/the option to change size up or down. When I clicked apply, I got an error msg, Error: 0x80042453