Internet Connection on Windows 7 Ultimate?!?!?

Okay so my first operating system is Windows 8 and then dual booted windows 7 ultimate(to play most pc games) . My problem is when I installed Windows 7 Ultimate(genuine) it won't connect to the internet(not the yellow caution sign but x sign). I'm using an ethernet cable, I went to"open network and sharing" then went to change adapter settings but it wasn't detected. I can safely say that there is nothing wrong with my internet and ethernet cable because I can still use the internet on my Windows 8. When I clicked on "diagnose connection problems" it said that drivers for my ethernet cable was not installed. This problem concerns me because I use online in most of the PC games I play.

My Computer Specs(if it matters)

-i3 3220(3.3GHz processor0

-4gb ram

-Asus motherboard

Here's my router specs.

-(BRAND/ISP)- PLDT(Philippines)

-Speed- 1mb/s

Ethernet Cable specs.

-(BRAND)- CD-R KING (Philippines)

Answer that works= 10 points

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Thanks in advance:)