I have a triple boot system from a single hard drive with 3 partitions. Vista Home Premium 32 bit is in the first partition, Windows 7 Pro 64 bit is in the second partition and Windows 7 Ultimate 32 bit is in the third partition. When I boot Windows 7 pro it always shows up as drive E:. The other two installations boot in C: as expected. I cannot figure out a way to force Win 7 pro to start in C:. Can anyone help? This doesn't usually cause a problem except that I'm trying to install some software that is searching for a file on C: rather than the current drive.