I made a boot entry for Mac OS X, and I've never gotten around to deleting it. (I don't have OS X installed on my PC). The new beta of Windows 7 won't install due to the fact that I have to select the OS/CD to boot, instead of the computer going straight into my existing operating system, and the rollback/saved status of the W7 install. . How do I find the GUID for my Mac OS X entry? . How do I delete it?