Replying to Help -windows 7 reinstall gone bad

Typically when i reformat my laptop I backup all my info and data, then pop in the windows CD and reboot. This time when i loaded from CD, i erased the existing partitions and created new ones but windows won't let me install it on the new partitions. This message pops up when I select one of the new partitions as the drive to install windows on, "setup was unable to create a new system partition or locate an existing system partition".

Anyone know what's going on here? I've never had this issue before...