You can also change it easily in windows. Just by going into the boot.ini file, which is a simple change but you should knwo what you are doing, or by goijng into the correct tab in device manager. I have 3 OS's on my old pc, and no problems switching preference order. There is also a program that comes with the partition magic suite called boot magic, but its a waste when u can do it easily through windows.
AMD Athlon 64 3500+ [939 Socket] W/ ASUS "A8N-SLI Premium" (OC'd @2.4ghz) | 560W Silverstone Spider PSU | Kingston 1024 MB [512MB X2] DDR-400 PC3200 Memory | Dual MSI Nvidia GeForce 6600GT 128MB DDR3 128-bit PCIe @555/1111 in SLI | Samsung 19" LCD 930B (8ms) | Western Digital 200 GB SATA II (x2) | LG Dual Format/Double Layer 16X DVD±R/±RW + CD-R/RW Drive