Windows 7 - What to buy?

Well I'm going to upgrade my laptop so it has Windows 7 Professionals

So I did go to their website and to order the shit. Then I can choose between buying Full version (Which is the most expensive) or Upgrade version (Cheaper)

But what do I need to take? I got this ASUS laptop with Windows Vista so do I only need the upgrade or how does it work? Pretty confused about the different between full version and just an upgrade version.

Thanks a lot for those who'll post useful answers.
Comments
13
Who buys Operating Systems anyway?
Solution : Torrents/Warez.
just google it ... you can do fresh installs with your update disc too ;) saves you 80$ (?)
xp requires full version
vista only requires update

that's all I know:)
lol pls just download the ultimate :d
just download ultimate -.,-
dunlut it
get full retail home premium
now
If you have already vista, the Upgrade Version will do since there's not that much difference between Win 7 and vista
Windows?

Buy??

?????
indeed why waste your money :|
from vista to 7 you can use upgrade disc, take ultimate!
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