Windows 7: Windows 7 Re-install - 2 Retail copies

Hi Windows 7 people,

I am hoping this is very easy to answer.

At the moment I have 2 retail copies of Windows 7, and have one installed on my desktop machine and one on my netbook.

I am upgrading the desktop machine, basically new motherboard, cpu, ram, HD and graphics.

I believe my key is good for a reinstall but I have a slight dilema as I don't know which key is installed on which machine! I obviously have 2 but didn't make a note when I first activated them. I don't want to get it wrong and have issues trying to use the same key on 2 machines.

Anyway I can cross reference information from the netbook / desktop installs with my retails key I still have in the boxes?

Thanks,

Mike

A key finding program will tell you which on each machine. There is a link to free one on this page
Windows 7 Key - How To Find the Windows 7 Product Key Code - Windows 7 Serial

Unfortunately that page links to Magic Jelly Bean, says it only works with Windows 7 keys when you pay $24.99 for the more advanced version?

Keyfinder | Magical Jelly Bean



Is there no way I can cross reference the product details from my Windows 7 info page to the DVD(s)? I don't actually need the key again as I have it, I just need to know which of my keys is the correct one for the desktop.

Not tried this one.
Belarc Advisor - Free software downloads and software reviews - CNET Downloads

Take a look at this tutorial:
Windows 7 Installation - Transfer to a New Computer

Use Belarc to audit all hardware and installed software including keys. Print it out and save it.

Belarc worked a treat, thanks guys.

Pleased to hear it and thanks for letting your respondents know.