Here it is and thanks so much for being patient:

[quote]mapmaker@mapmaker-desktop:~$ su
Password:
root@mapmaker-desktop:/home/mapmaker# lspci
00:00.0 Memory controller: nVidia Corporation CK804 Memory Controller (rev a3)
00:01.0 ISA bridge: nVidia Corporation CK804 ISA Bridge (rev a3)
00:01.1 SMBus: nVidia Corporation CK804 SMBus (rev a2)
00:02.0 USB Controller: nVidia Corporation CK804 USB Controller (rev a2)
00:02.1 USB Controller: nVidia Corporation CK804 USB Controller (rev a3)
00:04.0 Multimedia audio controller: nVidia Corporation CK804 AC'97 Audio Controller (rev a2)
00:06.0 IDE interface: nVidia Corporation CK804 IDE (rev a2)
00:07.0 IDE interface: nVidia Corporation CK804 Serial ATA Controller (rev a3)
00:08.0 IDE interface: nVidia Corporation CK804 Serial ATA Controller (rev a3)
00:09.0 PCI bridge: nVidia Corporation CK804 PCI Bridge (rev a2)
00:0a.0 Bridge: nVidia Corporation CK804 Ethernet Controller (rev a3)
00:0b.0 PCI bridge: nVidia Corporation CK804 PCIE Bridge (rev a3)
00:0c.0 PCI bridge: nVidia Corporation CK804 PCIE Bridge (rev a3)
00:0d.0 PCI bridge: nVidia Corporation CK804 PCIE Bridge (rev a3)
00:0e.0 PCI bridge: nVidia Corporation CK804 PCIE Bridge (rev a3)
00:18.0 Host bridge: Advanced Micro Devices [AMD] K8 [Athlon64/Opteron] HyperTransport Technology Configuration
00:18.1 Host bridge: Advanced Micro Devices [AMD] K8 [Athlon64/Opteron] Address Map
00:18.2 Host bridge: Advanced Micro Devices [AMD] K8 [Athlon64/Opteron] DRAM Controller
00:18.3 Host bridge: Advanced Micro Devices [AMD] K8 [Athlon64/Opteron] Miscellaneous Control
01:06.0 FireWire (IEEE 1394): VIA Technologies, Inc. IEEE 1394 Host Controller (rev 80)
05:00.0 VGA compatible controller: nVidia Corporation Unknown device 0392 (rev a1)[/img]

Thank you so much for the patience. Here it is:

OK.. So, the nvidia AGP device is located at "PCI:5:0:0" and while not really necessary when using only one card, you could put a line into the "Device" section of your conf file like:
Next, here are a few more options you can add to the "Screen" section under the 'DefaultDepth 24' entry; again these may or may not directly fix the problem you are having with the screen size, but can add performance to your setup, and *might* help:
And have you tried commenting-out the ' Load "DDC" ', and adding this to the 'Screen' section as well yet?:
And finally, have you gotten a copy of the nVidia driver tutorial? If not, please read and/or bookmark and/or download the file for reference.
As I said earlier, I don't see a specific problem with your file itself, and provided the driver is correctly installed (which it must be if you are using the 'nvidia' driver) then this should be working quite well.

Thanks again. Ubuntu can be daunting for mortals like me but thanks to people like you who are so very helpful.

However, I found something very interesting. So I edited the conf right? Also, I mentioned that I change the settings in applications>systems tools>nvidia settings when I log in because the screen is always small and when I go system>preference>screen resolution the screen resolution is 1024x768 with refresh rate of 50hz and after applying the refresh becomes 53hz. I found this conf file in nvidia settings and it is different from the conf file i edited.

Are the two settings in a way, in conflict? Actually, i followed what is written in the guide of Albert Milone and the thing is, the driver was updated but the settings i x server that I saved did not apply. Hope you can give some thoughts. Thanks.

I've lost the problem a bit. If you're current problem is that your refresh rate falls back to 50 Hz, try to add the bold line to the device section:
Once you're not on 50Hz anymore and your screen is still small, we will look at that; as far as I know, you can use modelines to influence the width of the screen.

And to expand on Wim's input above, in the case of metamodes, the '+0+0' can be used to stretch the screen's appearance. For example, by using "800x600 +100+0" would effectively create a screen width of 900 pixels, even though it is *actually* 800 wide. This is used for example with very wide-screen monitors, like 1440x900 and similar, to fill the screen with keeping the proper aspect ratio.

Ok this is what happened. So I followed all of your suggestions and like what I said in my previous post I always have to adjust the screen resolution in applications>system tools>nvidia settings to 1024x768 with refresh rate of 75Hz. Whenever I do this the screen becomes small when I restart even if I save the settings in /etc/X11/xorg.conf in the abovementioned menu. When I type sudo gedit /etc/X11/xorg.conf, the settings are different from the one I saved in applications>system tools>nvidia settings. So what I did was this, I copied the settings and typed sudo gedit /etc/X11/xorg.conf once the settings appeared I pasted it. I rebooted and the screen got bigger, looked at the nvidia settings and the resolution reads 1024x768 with refresh rate of 75 Hz but when I go to system>preferences>screen resolution, the refresh rate reads only 50 Hz. Which setting is working? The one I saved in xorg.conf or in the system?

This is getting a little odd indeed..
But one thing I suggest is this: Until you/we/someone figures out what you need in your xorg.conf file, stop using the nvidia-settings utility. It does not do anything that we need to do under the circumstances. Once you come to understand the config file and the options you need, *then* feel free to experiment with the nvidia-settings tool.

Sure seems odd that you are seeing 2 different resolutions in 2 different areas. But if your monitor has an on screen menu, it should say what resolution/frequency the screen is showing, and I would trust that most.

Xorg.conf is the final word as to options which X can try and use when starting the display, except in the case where the monitor doesn't like any of the chosen settings, and either turns off, or refuses to display anything, or resets to a mode it likes, or X aborts with an error..

Still thinking here and will add anything else I can think of!

The OSD of the monitor can probably tell you which refresh rate is used. Most modern monitors have that option (mine as 7 or 8 years old and has it.
And if you really have 50Hz (an unusual frequency to be honest, it will usually be 60HZ), your screen will flicker like made and you will probably have an headache after 10 minutes working with it.

Thanks to all of your help! I checked the monitor and it says 1024x768 and refresh rate of 75Hz. I find it very odd that after following all the things you suggested, the screen refresh is 50Hz. The color is more sharper and in way cool to the eyes. So does this mean that problem solved?

Your monitor can 'measure' the incoming signal and determine the refresh rate; your OS can't. So the monitor has the final say. If the monitor says 75 and your OS says 50, it is 75.

Thanks a lot ladies and gentlemen!