64 bit vs 32 bit on boot media

I am running a very old version of TI, about 6 years old, i was round my friends house the other day and he only ever uses the boot cd/dvd option you have and when i saw it run it had the option of using 32 or 64 bit which seemed pointless to me giving he would not be in a 64 bit OS, so can you tell me what is the point of the 64 bit option and is it something i should look at? I do run win 7 U x64 but as i say i can see no point to me upgrading or have i got the wrong end of the stick?
All1

Hi Bobbo thanks for the reply i think i'm lucky and have both legacy and UEFI motherboard is a Asus Z87 Deluxe and i do get the option of booting from the CD in either legacy and UEFI mode, i think i might move into the new world and upgrade just for the hell of it.
All1
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