Donwside of dual-boot

If you've set up a dual-boot system with Windows XP and Windows 7 (or Windows Vista) on the same system, you should be aware of one unfortunate side effect caused by this configuration. When you boot into Windows XP, the system wipes out all restore points created by the later Windows version. New restore points are created at the usual times when you return to Windows 7, but all previous restore points are gone. This unfortunate state of affairs is caused because Windows XP doesn't recognize the format of the newer restore points; assuming they're corrupt, it deletes them and creates new ones.