Can’t Register my Windows 7 Home Edition OEM

Hello,
I have acquired new Windows 7 Home Edition OEM. I installed the operating system using the DVD ROM which is included on the bundle. I have bought the Windows 7 Home Edition OEM a few months ago and didn’t install it immediately. I finished installing all needed to be installed on the said installer.
Can't Register my Windows 7 Home Edition OEM.
My problem occurred when I was registering the OS. I can’t register over the internet. The installation tells me something like “the server is not available, please try again”. I am trying to register for the whole day but I’ve got no luck. I have no issue on my internet connection and compatibility to may hardware is good.
Now, I have only 30 days trial installed. I need your help immediately. I don’t have the phone to call the Microsoft Hotline and I leave in the province. It takes 12 hours to go to the store where I bought this software. I don’t think that this copy is counterfeited; I believed that this is authentic. Please help me out.
