As with any multi-boot, you should add a 3rd drive / partition for Linux.
Then, start with this TR article.
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Once you have the drive setup, and Linux installed, you will likely need to manually add Linux to your boot options.
For information on the boot.ini commands, check out the dual boot page at www.systeminternals.com
Or, search Microsoft's site for the terms boot.ini and bootcfg
For general Linux information, subscribe to the Linux Tech-Mail.
Also, check out www.linuxorbit.com
There is a daily e-mail that one of their editors writes available from www.emazing.com
I recommend selecting the plain text format.
Chas