nVidia Stopped Working - SEVERAL Problems Now

I've had nVidia driver on my Dell Optiplex 760, Windows 7 Pro, 64-bit system. I've always been able to open nVidia from the icon pinned to my taskbar, should I need to visually modify anything seen on the screen.

Now, problems have arisen:

1. The nVidia icon on the taskbar won't open. When I click it, it takes at least a minute before a small error popup appears on the screen, telling me that it won't update (???). See error screenshot.
2. I've gone to the nVidia website, trying to update the existing nVidia software I have in my system but that also failed (see screenshot).
3. NVidia now seems to be blocking my Windows Update. When I do Windows Update, everything updates EXCEPT the nVidia software, halting the installation of all the other updates . . . a real thwart in the flow of progress (see Windows Update halted in screenshot).

Is there anything I can do to resolve this????? Do I even NEED this software on my machine? Is it necessary? Thanks to anyone who can assist.

Hi, Saurabh:

This evening, I did precisely as you had instructed in the removal of the nVidia display adapter. Immediately, when I did this, the graphics changed on my screen, becoming very narrow; and, of course, the colors/resolution also changed (somewhat "scarey" for a moment). But, then, I just thought I would go to one of the several text links you were kind enough to post in your message. But, unfortunately, none of them worked in opening up the download. The nVidia site just gave a message (some error message) and the Dell site - for whatever reason - would not open for me. So, I'm really stuck now "between a rock and a hard place" and don't know what to do to restore my screen. The web connectivity seems fine, and just the other evening, I am getting about 30 mgbs down and about 2.5 mgbs up. So, the speed is good. I just have a screen problem now and don't know what I can do to correct it.

My wife and I work for the school board and are home in the evenings about 5:30 p.m., E.S.T. Saurabh, may I impose upon you to offer any other solution in getting this resolved? I could even do a computer-sharing session with you such as gotomypc.com or pcanywhere.com, etc. Thank you, Saurabh for you kind assistance.