yes but your Win 10 drive will BECOME C at boot (and your XP will become some other Drive letter)


you need to read a LOT before even attempting this

This is GENERIC

http://www.howtogeek.com/214477/how-to-dual-boot-two-or-more-versions-of-windows/

this is specific (and I think it's THE identical artical I used to do MY XP and 7 with two physical drives, and not I will be ADDING win 10 on a 3rd drive and I will be TRI-booting here soon)

here is a dual for Win 7 and XP

http://www.sevenforums.com/tutorials/8057-dual-boot-installation-windows-7-xp.html

Win 10 and XP is very similar to above

Install oldest first, then next (younger), then the next younger, etc.

more

http://www.pagestart.com/winxpdbwin10tp1206141.html


HOWEVER having Win Xp in the multi boot lineup has one big issue: your Win 7 and win 10 restore points will be WIPED out ever time you boot the machine - it makes no difference which OS you boot into (XP, 7 or 10) WIN XP is FIRST and has the "boot loader" it doesn't like where/how restore points are saved and sees them as bad and deletes them

YOU NEED TO HIDE your Win 10 (and or win 7) drives from Win XP (don't need to hide Win XP from Win 7 or 10).

There are articles how to to do this

http://www.vistax64.com/tutorials/127417-system-restore-points-stop-xp-dual-boot-delete.html



I have my Win XP come up as drive Z (when booting Win 7) when booting Win XP it sees the Win 7 as a BLANK drive Z but it's not accessible (unless I do some really stupid administrative stuff while in XP)


READ a lot before wasting time with multiple re-installs or wrong order of installs, that require RE-installs, or worse yet wiping out current installs which brings me to:

(before others chime in with panic): MAKE a FULL IMAGE of your current working OS drive before starting!

Good Luck
Larry


Win10Pro,i9,64GB,2TBSSD+20TBHDDs,1080TI,BIAB'24,Scarlett18i8,Montage7,Fusion 8HD,QS8,Integra7,XV5080,QSR,SC-8850,SPLAT,FL21&others,Komp.14,IK suite&others, just a guitar player-AXE FX III &FM9T, FishmanTP, MIDIGuitar2, GK2/3'sw/GI20