Cannot connect to the internet Server Essentials '12 R2 DNS issue or driver?

OK so I have a very basic knowledge of Windows Server OS's. I have a HP Pavillion 20 Touchsmart PC that I am trying to use as a Quickbooks Point of Sale PC for a small resale business. I have Comcast Business Class internet. I downloaded the evaluation
version of Windows Server 2012 Essentials R2. I want to use it because it is my understanding that it is far more secure then Windows 7 Pro. I went through the server install and entered the information for the business at first startup and that's it. I did
not change any other settings. I have the computer direct connected via Ethernet cable to the router and it will not connect to the internet. I already tried connecting it directly to the modem to see if maybe the router was the issue but it is getting the
same error. I have my other computer running Windows 8.0 connected to the router via WiFi and it is working fine. I disconnected the WiFi on my computer and plugged in the cable directly to the laptop and was able to connect to the internet. So did some research
on the web and it stated that if under command prompt the IP address started with 192.168.x.x then the computer is assigning the ip address and not the router and that meant it is an issue with the computer not the internet connection. I figured that seeing
as how my laptop is using that internet connection right now, that the internet connection is fine. I was also told it could be a issue with the drivers so i went and tried numerous drivers from different sites (no 3rd party though) ie. HP and Atheros. I also
used a widely popular software called "Driver Pack Solution 13" and it had several drivers that it updated including the WiFi. I am not going to be using the WiFi to connect to the web so that is a non issue the fact that it is not even showing networks
in the area. I need direct connect to be working however. When I run the Network Diagnostic tool it says "Your DNS server might be unavailable". But it obviously sees the DNS because under the ipconfig settings it is showing "wp.comcast.net".
I don't have any other options here I know that there are some settings in the OS that may need to be changed. I have to have this up and running by tomorrow. If there are any Server Guru's out there PLEASE HELP!!! Thank you!

My guess is that your router is not handling DNS forwarding correctly.
Can you do an IPCONFIG /ALL from a command prompt and post the response?
Also, go into PowerShell and enter the following:
Get-ItemProperty -path hklm:\system\CurrentControlSet\services\dns\parameters
Post the response.
Robert Pearman SBS MVP
itauthority.co.uk |
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    Do other devices now connect?
    Did the iOS device connect before?
    Try the following to rule out a software problem:                
    - Reset the iOS device. Nothing will be lost
    Reset iOS device: Hold down the On/Off button and the Home button at the same time for at
    least ten seconds, until the Apple logo appears.
    - Power off and then back on your router
    .- Reset network settings: Settings>General>Reset>Reset Network Settings
    - iOS: Troubleshooting Wi-Fi networks and connections
    - Wi-Fi: Unable to connect to an 802.11n Wi-Fi network      
    - iOS: Recommended settings for Wi-Fi routers and access points
    - Restore from backup. See:
    iOS: How to back up
    - Restore to factory settings/new iOS device.
    If still problem and it does not connect to any networks make an appointment at the Genius Bar of an Apple store since it appears you have a hardware problem.
    Apple Retail Store - Genius Bar

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