I had as many as 4 installed at one point 98, 2K, XP, and RedHat and now I just use VirtualPC *sigh* "hard-core" troubleshooting days are now gone.... now it's just corrupt dns, crap ad, virus containment......so monotnus..yes difficult at times, but nevertheless. i enjoy some tasks though so i guess at the end there's more good then bad.. oops went way off topic there... but yeah back to your question Install 9x first with whatever partition size, then install XP on the remaining partition or whatever part you want. If you want to install a 3rd like 2K then make sure you make a backup of the ntdlr and ntdetect then just replace it after install is done. make sure you install XP first then 2K. And if you want to install a 4th like RedHat or something then go right ahead and install it but just make sure you pay attention to the partitioning part. to tell you the truth just hookup on a eval version of virtualpc and try it out, if you like it buy it or the cheaper version of it which i don't remember the name of. it'll save you a buncha headache. and hey there's an "undo disk" option which well let you "undo" your botch-ups. good luck