installing new cpu, mobo and ram best way to reinstall windows?

[R9mpo]

hello,

im going to be installing new hardware and think i need to reinstall windows 7?

i currently have windows 7? how can i get my key? is there any easy way to put it onto a stick so i can plug in and do a fresh install?

completely clueless here

 

[R9mpo]

im

Hello
The serial key should be affixed to your prior PC in my priors cases stuck out of sight on the rear of the PC

PS I'm hoping you're using a retail version of Win 7

im not no.. my pc was custom built a long time ago