After installing Windows 7 as a dual-boot setup, it’s automatically set as the default boot option (shown at startup). The default Operating System starts automatically after the specified timeout period elapses. If you want to unset Windows 7 as the default boot option, use the System Configuration Utility in Windows.

Start Windows (Windows 7, Vista or XP)
Click Start, type MSConfig.exe and press ENTER
Click the Boot.ini tab
Select an Operating System and click Set as default

Click OK
Note that this is not specific to Windows 7, but also applies to Windows 2000/XP/Vista.
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After installing Windows 7 as a dual-boot setup, it’s automatically set as the default boot option (shown at startup). The default Operating System starts automatically after the specified timeout period elapses. If you want to unset Windows 7 as the default boot option, use the System Configuration Utility in Windows.
Guys – use the software I mentioned earlier
http://neosmart.net/
I have a tri-boot system
2HD’s – 3 OSes
It works fine.
It also has a very powerful set of tools, one of which have helped me when a partition died
I’m not linked in anyway to the neosoft people, this is just great free software
Cheers!
Agree with Matt. This tip doesn’t work for me.
Actually, this tip didn’t work for me. In Windows XP, only XP is listed as an OS; in Windows 7, only 7 is listed as an OS. Each respective system thinks it’s the default, and I end up having to pick XP every time (now that I’m done beta testing 7 until the RC comes out)
re: My earlier post/iReboot 1.1
iReboot 1.1 DOES work in XP Pro.
For some odd reason I hadn’t installed it. Corrected this today and tested it.
My bad.
Thanks, great help, i changed time out to min 3 seconds so its a quicker bootup now
I had this issue with a dual boot Vista – XP Pro system.
I use EasyBCD 1.7.2 and also iReboot 1.1 to fix this and to choose which OS to switch to.
Works with Vista and W7 – You can choose to boot into XP if you run it, but the app is not able to run on XP (XP Pro)
Currently running Vista/XP Pro/Windows 7 Beta Two HD’s – tri boot.
XP Pro and W7 on same HD.
Get it from:
http://neosmart.net/