Desk top won't connect to internet even though it sees the signal?

I have a laptop, iphone and desktop all using the same router. Laptop and phone connect perfectly, no problems. My desktop worked perfectly as well until the end of February. OS is XP and it sees the signal but won't connect. It is also having issues updating my NVIDIA video card (not sure if this is a related issue). I have Webroot spy sweeper/ antivirus on my machine and I have run the program and I never find issues. In the mean time I have it connected via Ethernet in order to diagnose.
I have done the following:
Reset router followed by computer restart (multiple times)
Restored my desktop to January (before it stopped working)
Reinstalled all current XP updates after restore (still can't update video card)
Rest IP address (laptop and phone still work)
I tried using Malwarebytes and my computer would not run it (kept saying there was an error)
I can't uninstall Java (I thought maybe my computer got the virus from a while back through Java)
Any thoughts?

Try enabling DHCP in the modem. A LAN IP conflict can be solved this way.
http://en.wikipedia.org/...n_Protocol
http://www.webopedia.com/DidYouKnow/Internet/2007/IP_Address_Conflicts.asp

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