Please help me!!! very uncommon problem!! cant figure it out!!!

Ok i have a dell inspiron n4010 and it runs out a windows 7 32bit operating system but this system crashed completely would not load in safe mode or any mode at all a while back and the only windows disk i had acess to at the time was a 64bit so i downloaded it and it started working fine again but now all of a sudden it is trying to boot off the old 32bit operating system which is corrupt and it says i have 2 processing systems but it only shows windows 7 on the boot options and that one is the 32bit .....i need to know how to switch it to the 64bit in simple words please

i figured maybe theres away to edit boot option or something and switch the operating system to the other one maybe but idk or if theres a command i can use

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