Retrieving windows License key

I have an older Toshiba R-800 laptop that's dying. Before I dispose the laptop, I want to recover the Windows License key. This laptop was given to me at my previous workplace and at some point, they might have replaced the OEM windows installation with an installation of Windows Enterprise (I think?). I'm not entirely sure.

I now have a refurbished laptop (Lenovo Thinkpad) that I purchased 2nd hand. This has Windows 7 Pro. The copy of Windows on the Lenovo was a "trial" version (I'm not entirely sure) and that trial has expired. I keep receiving the error that this copy of Windows might not be genuine and needs activation. I'd like to activate it using the license key of the Toshiba. I tried entering the serial number that's on the back of the laptop on a sticker but that does not work.

I'm not sure if I'm doing something wrong, or this is not allowed or perhaps I'm entering the license key incorrectly (The sticker is slightly wo out).

Any idea on how I can use the earlier license on the lenovo laptop?

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