Windows 7 doesn't reset trial period limit after reinstalling

I am reinstalling windows 7 from usb. I have 3 days left from the trial and i have used all extended period of time that is allowed by microsoft. Before reinstalling windows i am running these commands from cmd:

bootrec /fixmbr
bootrec /fixboot

But after installing it still shows that i have 3 days left to activate.

Now, i have done this before and it worked, but i don't know why now it doesn't work. I tried two times without success.

I hope someone can help. I thought windows 7 is storing data for the trial period somewhere in the boot sector and running these two commands deletes all the data, but i guess i am wrong.

If I were microsoft, I'd store that info on my activation servers, rather than on user hard disks that are easily wiped.

 

 

I hope someone can help. I thought windows 7 is storing data for the trial period somewhere in the boot sector and running these two commands deletes all the data, but i guess i am wrong.

Yes you are wrong. Activation and licensing info are not stored in boot sector or MBR. You should buy a legal copy and enter the serial key to activate. 

Btw, you can legally download and install Enterprise evaluation version of either Windows 7 or 8 and run it for 90 days.  

So, to put it another way - what version are you trying to "use" in this manner?  Agent47 is right in that only the Enterprise Eval version will run for 90 days without proper activation.  The others give you the threee days (as you are seeing).

Try "format" before installing.

Or try this from command prompt as admin:

slmgr -rearm