How to Configure your Booting Options
If it is your intention to have multiple versions of Windows on your system, but the boot sequence is not correct, follow these instructions:
1) For versions of Windows installed in different hard-drives within your computer:
a) Enter your computer BIOS by hitting F2 or Del as soon as it boots (find out which keyboard key gives you access to BIOS by referring to your system’s owner’s manual, or by trial and error).
b) Enter the Boot Options of your BIOS Setup menu and change the primary boot sequence to be the hard disk in which your preferred version of Windows is located (or after CD/DVD drive, network, USB, Floppy drive as you prefer for convenience.)
c) Save your changes and exit BIOS. You will be set.
2) For versions of Windows installed in the same hard-drive (According to Microsoft):
a) Right-click My Computer, and then click Properties.
b) On the Advanced tab, click Settings under Startup and Recovery.
c) Under System Startup, click Edit.
d) Select your preferred primary version of Windows.
e) Save and exit. You are set.
3) Alternative (Advanced) edit of the Boot.ini file (According to Microsoft): a) Click Start, and then click Run.
b) In the Open text box, type sysdm.cpl, and then click OK.
c) At the command prompt, type bootcfg /?.
d) On the Advanced tab, click Settings under Startup and Recovery.
e) Under System Startup, click Edit.
Warning: If you will attempt to manually edit the Boot.ini file, make sure to ALWAYS make a backup. If the file becomes corrupt, you will not longer be able to boot into Windows. Also, this option requires knowledge of its parameters in order to be successful. Refer to this Microsoft Article for more information.
Booting the wrong version of Windows may be annoying, but if configured right, it may be a convenience when older or newer versions of Windows are necessary to accomplish specific tasks.