Windows 7 build 7601-This Windows copy is not genuine

So my I bought my PC from a Dell store so I KNOW that it's not a pirated windows. It's still showing me this message. I can still update regularly and it doesn't block me anything. It didn't even notify me that it's not genuine.
I tried to activate but the notification on the picture 2 keeps showing up. Could anyone help? I tried anything that there was on the internet.

Please do not repeatedly post the same question all over the site.

The duplicates have now been removed.

z3r010 said:

Please do not repeatedly post the same question all over the site.

The duplicates have now been removed.

OK, sorry doctor Doofenshmirtz xD

Britton30 said:

Have you tried to reactivate using the product key on the sticker some where on the computer?

I can find an "Express Service Code" and a " Service Tag" is that.. it?

IanDrexP said:

Bought directly from DELL or 2nd hand?

From a Dell store.. actually it's like one buliding, one side with only Dell and th eother with monitors and stuff that isn't dell :)

Britton30 said:

No, it is a sticker with "Microsoft" on it, the version of w7 you have installed and the 25 digit key.

When you find it, try this: Product Key Number - Uninstall and Deactivate in Windows then reactivate.

If there is no sticker, I can't help with it.

Hey, so I just saw that Dell doesn't even sell it with Genuine Windows.. I have an Optiplex 390 64 bit windows.. Not like I pirated it. I bought it full price, probably overpaid it.
So can I do anything? ..or am I boned?