to make your linux/win2k dual boot, you need to make two partitions first... then install W2k FIRST on your main partition.
After installing win2k, pop in the redhat cd and boot up from cdrom (or floppy with the redhat image bootup) and install linux on the second partition, but here's the trick.
You need to specify a boot partition on your second partition so you can install the boot information on there. When it asks if you want to install it on the MASTER BOOT RECORD, SELECT NO and INSTALL IT ON YOUR BOOT PARTITION. Make a linux boot disk when it asks you for one. It will then do the install and when its done and you reboot, you should still be booting up into Win2k (if you booted up into linux, then you need to reformat and start over). Reboot into linux using that boot diskette, dump out the first kilobyte of the boot sector info into the disk, reboot into w2k, copy that bootsector info into c:\, and edit your boot.ini to read that and you should be able to select.
if you want more detailed information, just search on google for "dual boot linux win 2000". There's plenty of how to's on there
hopes this helps!