I have 3 OS on my computer I need to remove 1 of it how should I remove it

[shrioffice2007]

I have windows 7 twice installed o my PC & windows Xp
I want to remove one of the windows 7 copies how should I remove it

 

[BSOD BSTD]

if its on its own drive partition the best thing would be to move any personal files and format the partition.

 

[0xBahaa]

if its on its own drive partition the best thing would be to move any personal files and format the partition.

In addition to that, he should see how he does the triple boot (for example: using GRUB) and delete the entry of the OS he's going to remove.