New
#81
Sorry for late reply mate but have had to work double shifts and been away.
If you buy an OEM then it will be about a half of the price of a retail version but I would be looking around real soon as it is becoming harder to get - out here at least I pay about $100 for it and about $200 - that is direct from Microsoft but you could have a hunt around for one.
But if you have an original key (activation code) then use this Clean Reinstall - Factory OEM Windows 7
and if the original came with the manufacturers bloatware on it it will be gone too so you get a much "cleaner" and efficient machine.