Tweak3D has posted a dual booting guide for Windows9x and Windows 2000. Here a snipped:

For a long time, the Windows 9x code base had the compatibility to run your favorite applications, and the Windows NT code base had the speed and stability needed to be considered reliable. With the coming of Windows 2000, however, this line is beginning to become less and less defined, as it adds many of the usability features of the 9x code base to itself. As a matter of fact, I would wholeheartedly recommend any intermediate to advanced computer user move to Win2k.

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