Windows 7 activation key

I have windows 7 installed on a PC and a laptop. I gave the laptop to my mother in law recently. It was fine until she got it home and accessed the internet but now it says "not a genuine copy of windows" or whatever the message is.
I have 2 activation keys but can't find where I wrote down which was used on the PC or the laptop. Is there a way to find what the activation key was that I used on my PC so that I know which key to use to reactivate the laptop?

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gosh1976

right click on computer and click properties. You may need to scroll down to see the key.

earweed

That's the product id or product key. I want the 25 character/ 5 sets of 5 activation key. Is there a way to find out which one was used?

gosh1976

oh yeah. here's a free program that seems to work Repair Tool of the Week: ProduKey | Technibble

earweed

Thanks, That worked.

Hyper-Me

BelArc advisor is also a good tool. It'll give you keys for amlmost every peice of software you have installed as well