I had Windows XP Media Center installed on my machine and wanted to try out Windows 7. So I created a new partition on my hard drive, and then installed Windows 7. When I start my machine it asks if I want to start windows 7 or an earlier version of windows. Windows 7 starts and works great, but if i try to start xp the screen just goes black, and doesnt do anything. How can I fix it so I can dual boot properly?