If i'm not wrong you need to revalidate the key every 3 months, this is the same for any Windows 7 OEM licenses. (It might be only for SLP keys for Win7 i can't remember)
You can try changing the key to the one on the sticker if you're still using the OEM key which came with the system (Like if you bought a branded computer or a laptop).
The key which came with the system is different from the sticker one.
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