as the title says i want to know how to delete win 8.1 pro finally!!!

i m using a laptop which runs on win xp 32bit and recently i installed win 8.1 pro 64bit to test it how it works on my laptop. my hdd has 2 partitions and i installed it in the other partition, not in the partition where win xp is located. after installing i found hat its not enjoyable on my laptop bcoz of my very small screen size and also and more importantly bcoz i didnt have complete access to the folders of win xp 32bit so that i can copy my files from here to win 8.1 pro 64bit. so i rebooted my laptop and i logged in win xp and deleted the partition where win 8.1 pro 64bit was located. then i rebooted my laptop again  and while booting, my laptop wasnt booing. it just showed a win 8 logo and below it was written preparing automatic repair. however it took a lot of time so i gave up on it and turned off my laptop and then started it and installed win 8.1 pro 64bit for the second time for my laptop to boot. after installing i rebooted and this time they gave me the choice to choose the os in which i want to boot but now there were 2 win 8.1 pro 64bits. i selected win xp 32bit but now i left win 8.1 pro 64bit as it is. so i want to know how to delete win 8.1 pro 64bit in my laptop on another partition from a win xp 32bit on another partition and also i want to know how to remove the other win 8.1 from the boot menu.

When I do things like this one, I backup original installation. After finishing my tests I restore from backup.

Better forum for questions like this one is in answers.microsoft.com

Regards

Milo

original installation doesnt matter. i have the original installation. i just want to delete those 2 os

it is quite simple.All you have to is remove the main boot file on startup..Before deleting win 8.1 logon to xp and type in cmd msconfig and locate to startup menu and there select the boot file..select win 8.1 and click remove and format the windows 8.1 partition 

u mean in the run program? ok i typed it and cmd.exe opened now what should i write here

not in cmd..type in run box  MSCONFIG and enter 

i dont get it. in the startup menu there was no boot file

sorry .Click  Boot.ini option near start up  to see 2 OS select one i mean xp and click set as default ,It i being difficult to say cause i don't have X

You can have a look here 

http://www.howtogeek.com/howto/windows/how-to-delete-modify-or-disable-an-incorrect-or-duplicate-entry-on-the-xp-boot-menu/

http://www.groovypost.com/howto/howto/how-to-remove-an-os-from-windows-dual-boot-config/

https://support.microsoft.com/en-us/kb/888023?wa=wsignin1.0

those things doesnt really help coz they r for deleting another win xp.

thanks. appreciate your help

Pretty sure the steps are the same for removing other OS's, the second link provided by Santanu should work.