Super User is a question and answer site for computer enthusiasts and power users. It's 100% free, no registration required.

Sign up
Here's how it works:
  1. Anybody can ask a question
  2. Anybody can answer
  3. The best answers are voted up and rise to the top

So I just reinstalled Windows 7 on my dad's PC. The thing is i accidently installed Win 7 Ultimate (x64). The key (legit key) I have is for Win 7 Professional (x64).

What are my options. I do have the ISO for Win 7 professional also. Is it just cleaner and safer to reinstall Win 7 professional? how bad is it on the harddrive? the harddrive is fairly new.

share|improve this question
up vote 10 down vote accepted

Reinstalling will be no problem for your harddrive as you will only be rewriting a small percentage of the disk.

It also seems like the simplest option for you.

share|improve this answer
Just make sure you do it before you set everything up, otherwise it's a bother. But since modern HDDs are meant to run with years of use, rewriting a few gigs at the start won't even dent it. – ssube Nov 6 '10 at 20:44

Your Answer


By posting your answer, you agree to the privacy policy and terms of service.

Not the answer you're looking for? Browse other questions tagged or ask your own question.