[midhunmon]

Hey man, I too have an intel 865GBF board and i have installed win98 along with windows XP. Intel's 915 and above boards will only support Windows 2000 and above. So u can install windows 98. By the way do u have a SATA hard disk drive. If yes, then that must be what prevents u from installing windows 98. It supports Windows 2000 and above.
If u want 2 run a game in win98 compatibility, then in winxp right click on the exe file of the game and select compatibility tab from the menu that pops out.Then check the box that says Run in compatibility mode for and select the OS as win98. It probably will work. Reply...........