I Have a compaq evo n800v that I just got and it has an Ethernet cord running into my router and all of my other computers that go to that router are getting the internet but my laptop isn't. If anyone could shed some light on my problem that would be great thanks :)

You need to check things.
Are there any lights near (usually at the top) of the ethernet port ?
Is the LAN connection disabled ?
Have you tried a different cable/router port ?

That should do for starters.

There are lights on the front of the router
The LAN is sending but not receiving
I have tried differt cables and ports

In that case the issue is with the laptop and you need to check the connection there.
Sounds like it might either be simply disabled or might need the driver reinstalling.
Compaq Evo n800v Notebook PC -  Download drivers and software - HP Business Support Center (http://h20000.www2.hp.com/bizsupport/TechSupport/DriverDownload.jsp?prodNameId=97150&lang=en&cc=us&prodTypeId=321957&prodSeriesId=96321&taskId=135)

Go to your laptop and press control panel and under network and setting select the connection, right click it, select properties and click on Local Area Connection and press properties, select the auto detect and see if it works, or else try plugging in a USB internet card on your laptop, I'm not sure but I'm guessing that either the setting is wrong or your Internet Card is busted.

How would you enable it?

Whenever I try and connect to the internet it asks me about broadband and dailup and stuff but I have cable(comcast) so I don't no what that is about

OK so this is the first time you have connected this machine to the router.
Follow the instructions for Network/LAN settings.

Where would I find these directions at?

whenever i try and connect to the internet it asks me about broadband and dailup and stuff but i have cable(comcast) so i dont no what that is about
You mentioned it here.
Follow what it says about broadband/LAN

It asks for account name and passowrd

OK cancel all that.
Open Internet Explorer, cancelling any pop ups you might get.
Tools > Internet Options > Connection Tab.
Select Never dial a connection.
LAN settings
check automatically detect and uncheck ALL others.
Click OK all the way out.
restart IE and it should be connected.

If that doesn't get you online, then try this.
Start > Run > Type CMD.
In the black box type IPCONFIG /ALL and then post back the IP address it is returning.
Should be 192.168.x.x (x being a random number)

Here is all it gave me
Windows IP Configuration
Host name... :XPLAPTOP02
Primary DNS Suffix... :
Node type... :Hybrid
IP routing Enabled... :NO
WINS Proxy Enabled... :NO

Ethernet adapter local area connection:
Media State... :Media Disconnected
Discription... :Intel(R) PRO/100 VE Network Connection
Physical Address... :00-08-02-63-6D-64
C:\Documents and Settings\Administrtor>

My bad I missed a part after the physical address is...
Dhcp Enabled... :NO
IP Address... :192.168.0.221
Subnet Mask... :255.255.255.0
Defult Gateway... :192.168.0.1
DNS Servers... :192.168.0.5

Here's your problem.

Dhcp Enabled... :NO

Right then need to change that to DHCP enabled so it gets an address from the router.

To do so I...

Here goes with pictures.

Start > Control panel > Network Connetions (might need to change to classic view)
LAN1

https://www.askmehelpdesk.com/attachments/networking/6113d1202424075-cannot-connect-router-lan1.jpg

Right click Local Area connections.
This brings up LAN2

https://www.askmehelpdesk.com/attachments/networking/6114d1202424075-cannot-connect-router-lan2.jpg

Select TCP/IP and click Properties.
This brings up LAN3

https://www.askmehelpdesk.com/attachments/networking/6115d1202424075-cannot-connect-router-lan3.jpg

Change the settings to automatic.
Apply and OK all the way out.

OMG! THANK YOU THANK YOU THANK YOU. That was driving me crazy. You deserve an award or something

No worries, that's what we are here for.
Glad I could help and I hope you enjoy the N800.
I have used several and I have been impressed with the machine.