I don't own a GF myself, but all Nvidia cards install pretty much the same way.
First - Is your motherboard's AGP slot correctly rated for the new card? Not all AGP slots are the same. For example, my Athlon 600's mobo came with an AGP 2x slot, which wouldn't work with the new GF4 cards that need a 4x AGP.
This is a show stopper. If your mobo isn't rated properly, you should return the card immediatly for a lesser card ( or your money back ).
Next - Put your old card back into your computer and boot into windows. It doesn't have to be configured correctly, as long as you can get on the internet. Go to
http://www.nvidia.com and download the newest Detonator drivers. I always get the newest video drivers off the web because some cards ship with drivers that don't work at all!
Next - Reboot your computer into safe mode. Do this by rebooting, and a few seconds before the Windows98 logo comes up, start mashing the F8 key constantly. It should open up a black and grey text menu with several options, one of which is called 'Safe Mode'. Cursor down to it and press enter.
Next - When in safe mode, open 'My Computer', browse to 'C:', browse to 'Windows', and then browse to 'Inf'. This folder is hidden on some computers, so if you can't find it you'll need to tell windows to show you hidden files:
Do this by going to the 'View' drop-down menu, then select 'Folder Options', then select the 'View' tab. Under 'Advanced Settings:' you'll see a section 'Hidden Files'. Click the option for 'Show all files' and then click Ok. You should now be able to find the 'Inf' directory.
Once inside 'Inf', find a file called 'Dxnvidia.inf' and if it's there, delete it. Now close 'My Computer'.
Next - Right click on 'My Computer' and select 'Properties'. Now click on the tab 'Device Manager' and look for the heading called 'Display adapters'. Double click this. You may have several things listed under it, or only one. Whatever is in it, right click on each one, and select 'Remove'. Once you clear them all out, click 'Ok'. Make sure your driver CD that came with the card is NOT in your CDROM.
Now shutdown the computer and install the new card. This time when you reboot, it should tell you that it found a new device. At this point, you do NOT want windows to know that you have an NVidia! By just clicking 'Next' a couple of times it should automatically detect a PCI VGA Adapter. This is what we want. Let it install the driver and reboot.
Now, FINALLY!, when it reboots this time, you can run the driver executable that you downloaded from NVidia. It will install the drivers, and will probably have to reboot a time or two. Everything should be working at this point.
If it STILL won't boot up after all this, and you're SURE that your motherboard supports the correct AGP speed, then you have an IRQ conflict. This means that your new card and something else in your computer are not playing nice with each other. These are a pain in the ass to diagnose and fix, and in some cases I was never able to get two cards working together. Your best bet at this point would be to take the PC to a local computer shop that does PC repair, because it can literally drive you nuts trying to fix it.
Whew.
As you can probably tell, I've installed a few NVidia cards. ( I used to run a local PC shop. ) If you follow the above sequence, and the planets are aligned
, it should work every time.
Be sure to let me know how it goes. Good luck!