i'm looking all over the net and i'm seeing multiple answers to this question. does someone know how many times i will be able to install vista if i have a retail copy be4 i have to purchase a new key or what not? are all versions of vista the same for this? home? premium? ultimate? maybe home version let's you install once while ultimate let's you install multiple times? do i have to keep the same hardware, but can format and reinstall as many times as i want? if i change out the mb/cpu once i'm fucked? or maybe once and that's it? can anyone shed some light on this pic? thx.