Source: PRONetwork
I had XP already installed and added Windows 7 on a separate drive (not partition). Installed fine but the boot menu will not load Windows 7. When you select it, gets an error message and says to run repair. After that I went into the BIOS and changed the drive priority to boot off the Windows 7 drive first and a different boot menu comes up and Windows 7 loads fine but XP will not.
