hi, i tried to had Win98,2000,xp,2003 as my multiple boot. started with win98 but when it came to "installing hardware compnents' part with some 8 mins remaining it showed this 'your multi-funtional device (Standard Dual PC IDE controller) has some child device using 32-bit drivers and other using compatibility mode drivers. This configuration is not supported, so your computer has been halted to prevent corruption" i m having 160GB SATA HD,AMD athlon dual core then i had win2000, XP & server 2003 running successfully as my multiple boot option installed on different drive. with drive C as my active partition having win2000 in it. i tried to install vista with DVD ROM as 1st boot device but it kept showing error some file/driver missing windows\system32\drivers\fltmgr.sys i tried to install vista after booting with XP. installation started but after copying files PC restarted n then nothing happened...blank screen, not even the multiple boot options anymore. i reformatted my HD, installed XP & then successfully installed Vista but then i installed win2000 & woof! Vista was gone from boot option though the files were there in the drive but now i had XP & 2000 as boot option. is it possible to have all 4 as multiple boot option? if yes then whats the proper order of installation? if no then which all Windows OS can co-exist with Vista as part of multiple boot. have few more queries regarding multiple booting with linux but later looking forward to answers, regards.