I originally posted on this there, back in 2003. Not too long ago, I saw a user here quote that 'You can only install one OS per partition.' ; in reference to Windows XP. With my knowledge of the area, this simply not true ! So, any questions about it, post here and I'll be happy to try and answer them. In a nutshell, you can locate "%SystemRoot%", "%ProgramFiles%" & "%AllUsersProfile%\.." anywhere you want them! I have used this to split-up my installations like so... C:\Win510.A (equivalent to C:\Windows) C:\Win510.B C:\Win510.C D:\Win510 Users.A (equivalent to C:\Documents and Settings) D:\Win510 Users.B D:\Win510 Users.C E:\Win510 Programs.A (equivalent to C:\Program Files) E:\Win510 Programs.B E:\Win510 Programs.C I could've placed the directories on the same drive, but opted to place them on different drives to enhance performance. On drive E also, I've placed my %TEMP%, %TMP% & %MsDOSData% directories, as well as "PageFile.Sys". Program downloads are appointed to that drive also. My Media directory, I've relocated to drive C as "C:\Media510.A". Drive B, which is never used, has been "Subst.Exe" to the hidden directory "D:\Drive_B.Sub". Very efficient, data-safe, reliable and versatile setup... been proven and have been doing this for years now. ENJOY !!! The possibilities are ENDLESS !!!