Windows 7 activation

I'm sure you have heard about this problem a dozen times and i hate to be a pain and ask this again, but i don't want to spend hours looking for the "same" thread.

I have installed windows 7 on my dads, moms and two of my own PCs and of course; I didn't read thourgh the lisence agreement properly and might have skipped a few lines and miss the fact that i cant install Windows 7 on all the PCs with the same activation code.

Can i buy three new codes (preferable download them via online)? Or do i have to buy three new Windows 7 jewel case from the store and install it again?

Please answer because i hate to disappoint my parents.

You should be able to buy a "Family License" which covers three PCs.

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