W7 activation problem

[omer620]

So I have a Win7 PC (Dad bought new one, gave it to me) It has Ubuntu 12.04 LTS. installed cuz my dads workplace use Linux. And in its bottom it has a win7 home premium serial key , just like every pc. So my question is, can I use this key? I have a fresh Win 7 uncracked Home Premium iso
?
Please answer?

 

[dKp1977]

If it's not in use anymore, sure.