You can install this on your new pc so long as you wipe the old one (never sell a used pc with your old windows still on it, in fact i would keep back the hard drive but that is just me). as for the lifetime updates, there isn't one as has been mentioned in this thread, whether the company has backtracked or not is unknown . I believe the nag screen was introduced a little after Ccleaner was bought out but i could be wrong on that, So long as you use the same registration name and number you can install this on your new pc , i have done so many times on my computers without issue.