For XP and 2000, it's possible to dual boot them.
For Windows ME, 98 and 95, it's impossible, because they use the
same boot file, and the same file system (FAT32). It's very hard to
hide the different operating systems, so either it crashes or you
get funny errors.
Those wanting to know how to dual boot Linux and XP, just take my
school worksheet.
http://myfile.sg/zb45
Don't know how to do it, bring your PC to computer shop or pay me
to do for you. 