My problem is ethernet controller for my unit can you give me a driver for that

That yellow exclamation mark means you don't have the correct driver for your ethernet card.
You didn't say if your operating system was 32-bit or 64-bit so I'll give you links to both versions of the driver.

Here is the 32-bit LAN driver:
http://img.dfi.com/Upload/Driver/CM/Marvell_LAN_729.zip

Here is the 64-bit LAN driver:
http://img.dfi.com/Upload/Driver/CM/Marvell_LAN_731_x64.zip

If you need any other drivers for your motherboard you can get them here:
http://www.dfi.com.tw/DFI-Lanparty/support/MBDriverDownload.jsp?selectedDriveritemId=349

Since your wireless is working, the missing driver is for your ethernet port. Go to gateway support driver download (link below). Select your computer by following the on screen prompts and download the driver for you LAN port.

http://support.gateway.com/us/en/product/default.aspx?tab=1

hoping yours is realtek network card i am giving this location

http://www.realtek.com.tw/Downloads/downloadsView.aspx?Langid=1&PNid=14&PFid=7&Level=5&Conn=4&DownTypeID=3&GetDown=false

http://www.broadcom.com/support/ethernet_nic/downloaddrivers.php

http://downloadcenter.intel.com/SearchResult.aspx?lang=eng&ProductFamily=Ethernet+Components&ProductLine=Ethernet+Controllers&ProductProduct=Intel%c2%ae+82573L+Gigabit+Ethernet+Controller

http://download.cnet.com/PCI-Ethernet-Drivers-version-A01/3000-2112_4-109142.html

Hope this helps.

If this helps you resolve your problem, please
consider giving a good rating and a quick thanks
or good job.It will help me as well Thank you.

obtain the driver from cd/dvd that was included as you purchased your desktop and try to check if the driver supports with the operating system you are using now. for example the driver available in your cd/dvd is only for windows xp and your operating system you are using now is windows vista of course driver not installed. try to download from internet the driver that are suite to your unit model and current operating system this can fixed your problem or else downgrade your os tha can support the driver that are available from your cd/dvd.

if you give me the model number i can find one for ya.

give me your laptop model and company name so i give ulink to download drivers

Drivers are here:
http://h10025.www1.hp.com/ewfrf/wc/prodTopCategory?product=96027&lc=en&cc=us&dlc=
Just click evo d510 cmt, then download drivers and software.

You should now be at a page that lists all of hp's drivers for your system.

I think PCI simple Communication Controller would be your modem, which I saw on that page, and also the driver for your ethernet controller.

Go to www.intel.com/design/motherbd/av/av_drive.htm#Win and your issue is resolved.

Please give me a rating

can you give me the model of your NIC Card?