If you go to System Properties by holding down the key and pressing pause break in the top right of the keyboard, does it say Windows Activated if you scroll down to the bottom?
Either they gave you an illegal install of Windows or there's a problem with the product key.
If it's an illegal version of Windows then when your computer ran Windows update it patched the method of activation that it was using thus causing your pc being flagged for not being genuine.
A lot of times reactivating the PC will resolve the issue if it's a legit copy of Windows. This can be accomplished by the System Properties box and on the bottom click Activate Windows.
Here is a guide to help you activate Windows if you have any problems.
Also something to check as well is the software protection service to see if it's set to Automatic and not Manual.
1.Press the key and type services.msc in the search box.
2.Go to where you see Software Protection service and see what its set to. *It should be Automatic*
*Please try this as well to see if it goes through successful*
1. Press the key and type slmgr.vbs /dlv
2. A dialog box should pop up.
Edited by chrisd87, 18 October 2013 - 12:19 PM.