re-installing WB, and serial key

i was wondering, weather i would have any probelms in terms of serial keys, if i uninstaled wb5, would i have anyprobelms re-instaling it, im not shure weather the serial key is one time use or something, i need to format my computer, and i know that for the windows xp serial key you have a limited nubmer of times u can use it, so basicaly im wondering if theres something ilke that for wb5, i dont want to format and then, i have to buy another key or something.

excuse the noobness