"Limited connectivity" issue that won't go away

Hello all, I've been working on this computer the last few days. The problem is that the network connection isn't working, it gives the message: limited or no connectivity and the connection isn't working. I've done quite some testing, I'll list it and the results below:

Changing network cable - didn't work
Testing network cables on another computer - works
Testing router with other computer - works (dhcp as well)
Setting IP address manually - removes the error message but still no connectivity to the router nor the internet
Repair connection - instant error that it can't get an IP address
Ubuntu linux live cd - the connection to the router and to the internet works
Turned off firewall software - still not working
Updating driver - wouldn't let me since the version was no better or something
Reinstall card - finds the card and connects a driver straight away

Conclusions from testing done (tell me if I'm wrong please):
The network card, the cables, the router and the internet connection are all fine.
The issue is software based, either driver, configuration or windowswise.

System specs:
Windows XP SP2
Dell Dimension 5000
Network card chipset: Broadcom 440x
Router: Some netgear wireless thing, rather irrelevant by the looks of it.

Questions:
Obviously some help on how to solve this.
I'm also wondering what windows services are involved in this so I can check that everything that should be running is running.

Thanks in advance.

 

The only thing that i can think of and may not seem as a important question or you may have tried it already but is the hardware that you go compatible with your linux operating system your running??

 

Not sure if I was clear enough in my post, I'm trying to get the card to work (again) in Windows so I did a test in Linux and it worked in Linux .

 

ok sorry my mistake maybe you will need to re-install the operating system.

 

I have a Dell B110 I use for files and online stuff, it's not a scream machine. I wanted to up grade it as much as I could. The400mhz memory ony runs at 266, so the gig I bought was a waste. The video card I shipped back because the Dell just wont see it. That could be your problem. The guy from India that I spoke with said to buy the vid. card from Dell ( even though it's the correct card I did have). I can only say this Dude we got a Dell, and it's my last one!