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First of all – Go to: Controll panel \ Programs and Features.

Then press View installed updates, wich you have on the left side.
Search for Update for Windows 7 called: KB971033.
Uninstall it if you got it installed.

You can reset your rearm count up to 4 times, each “slmgr /rearm” command give you another 30 days everytime your rearm count is over use the following instructions to reset your rearms count back to 4:

Instructions:
Be careful if you dont get it right your going to have to do a clean install

1) Stop the Software Protection service -sppsvc:
Run: services.msc – look for “Software Protection” service and right click on it > Stop).

2) Move your tokens.dat to your desktop
Go to: C:\Windows\ServiceProfiles\NetworkService\AppData\Roaming\Microsoft\SoftwareProtectionPlatform

3) Move the files with “.C7483456-A289-439d-8115-601632D005A0” extention to your desktop
they are hidden, so you need to ajust so you can see hidden files.
Go to C:\Windows\System32

4) Start the Software Protection service

5) Open command prompt as admin and run “slmgr /dlv”

6) Stop the Software Protection service again.

7) Put the files on your desktop back to their place and and replace them.
C:\Windows\ServiceProfiles\NetworkService\AppData\ Roaming\Microsoft\SoftwareProtectionPlatform
C:\Windows\System32

8) Install your default product key.
Open command prompt as admin and run “slmgr /ipk XXXXX-XXXXX-XXXXX-XXXXX-XXXXX”
change “XXXXX-XXXXX-XXXXX-XXXXX-XXXXX” to your edition default key:
Ultimate – D4F6K-QK3RD-TMVMJ-BBMRX-3MBMV
Professional – HYF8J-CVRMY-CM74G-RPHKF-PW487
Home Premium – RHPQ2-RMFJH-74XYM-BH4JX-XM76F
Home Basic – YGFVB-QTFXQ-3H233-PTWTJ-YRYRV
Starter – 7Q28W-FT9PC-CMMYT-WHMY2-89M6G

9) Reboot your computer.

10) Open command prompt as admin and run “slmgr /dlv” again, and you will see that your rearms has been reseted.