Guys please help me, I bought my laptop last June 12, 2014 and it had Windows 8.1 pre-installed in it. The hard drive was broken so I had to bring it to the place where I bought it December 2014 and they asked me to buy a new hard disk so I bought a Hitachi 500gb HDD and they said they'll be the one to install the OS so they did and it was a legal OS. Since they my laptop was working well but just now when I started it up it prompted "Your Windows Licence will expire soon." while I was surfing the net. I looked at the System Properties and it said their that the Windows is activated but when I looked at the PC settings it has a menu which says "Activate Windows" then when I click it, it has 2 options: "Activate Windows Online" and "Enter a new product key". I clicked Activate many times but it fails. Please help me. Thanks in advance.