Will I have to re-activate windows when I clean install?

Something in windows has broken so naturally I want to re-install it.
I just want to know if I will have to re-activate it?
Last time I changed around a disc drive it wanted me to re-activate.
Will I have to make that awkward phone call when I re-install or is this reserved for ye olde hardware changes?

 

Yes,

all you have to do is click the activate with out registering if you like. It will look for a connection and do it's thing, you can later register if if you like.

 

you need to click on activate but don't have to make another phone call. you do that only if there is a hardware change.

 

Okay thanks.
Now I think I can just about cope with a re-install!