Installed windows 7 lost my internet connection

I upgraded from XP to win 7. (big mistake)
After it activated and updated, I prepared to REINSTALL ALL of my applications.
I lost my internet connection. I cannot register any more MS software....
My computer says everything (hardware) is working normal.
It tells me that the modem and ethernet have the wrong IP address.
Using a dos prompt, I did IPCONFIG, both release and renew. NOTHING works.
I even installed a new driver for the ethernet card, SAME PROBLEM...
Frustrating, why would any one want to upgrade to MORE problems?

Chris

As I installed it, it asked if I wanted to install the latest dirvers, and I clicked Yes/OK.
It is while I am reinstalling all of the applications, that I lost internet.
Although, I am somewhat encouraged this evening, I went to shut down and my computer had new updates to install as it shut down.
YET I cannot connect to the internet in the normal way.
This is frustrating, that MS7 can connect to the inet, but Internet Explorer CANNOT...
I am using another computer through my router and cable modem to reply to this, so it cannot be those items that have the problem.
It seems to be IN 7.
I also kept an older HDD with XP on it from the computer that now has 7 on it.
I unplugged the HDD with 7 on it and reconnected the HDD with XP and it worked, so it cannot be the ethernet card inside my computer, it HAS TO BE the settings within 7, but which ones and where do I find/access them?

i guess you're connecting to the internet using the ethernet cable.what's the status of the network and sharing center?(start-control panel-network and internet-network and sharing center)on the left hand side click on change adapter settings.right click on your connection and check it's status.You can also click on diagnose,and it'll tell you what the problem is.also selecting properties you would check for the internet protocol versions 6 and 4 and configure an ip address if yo need to.if not make sure they're on automatic.you could post an image of the status,for more help.
i hope it will be of help for you.
also check in device manager the status of the network adapter.

+1. I saw this problem under Vista a number of times. I never download network drivers via Windows Update for this exact reason. Let us know if the driver rollback works or not.

I had problems with network drivers updates from win update too,you might be right.

It's a very common issue with Win7 at the moment, particulary if your network card is made by Broadcom, Marvell or 3com. Many people also getting IP on boot up, but after warm reset it loses connectivity. All of the above companies have now issued Windows 7 drivers for their NICs, it sorted out the problem on my Marvell instantly. Little tip however, Win7 update will try to download the manufacturers updated drivers for you, in the case of Broadcom drivers they don't work as well and you are better off going to the broadcom website instead....

IMO, System Restore potentially creates far too many other problems to risk using it for driver reversion. Roll the driver back from the device manager instead of System Restore and be done with it.