Is that error list from when you had the GeForce installed or the ATI? If it was the Geforce then it's looking for the ATI, all the driver and startup information might not have been removed.
Most of your errors are Timing issues. W32Time can be configured differently . . . however that dll configures the time on your computer so it will co-inside with servers online.
Well, here's what I would suggest: Uninstall your video card completley, Find an old hunk of junk video card lying around, hopefully you have one, it's fine if it doesn't have 3d acceleration. Boot windows and see which errors you get.
If you get errors that it can't load something for an ATI card or something you need to go through your device manager and registry and remove left over driver information (In your registry , regedit, you search for something like ATI, and delete some of the values that come up, in case you didn't know).
Now, the W32Time errors are from w32time not being able to connect to the DNS servers for the time, I'm assuming, since you're using a 56K, when your computer boots up you're not connected to the internet, I'm pretty sure that's what it's whining about, try to find the control for it and turn it off, just so it doesn't think you're online constantly, try using the Windows Help (gasp). I know it's evil, but it actually helps sometimes. Go here for some configuration help:
lodogg.
Try those things and if you get to the point where you have no more errors put the Geforce back in. Also go here:
nVidia XP drivers
I know the card came with drivers, but this is a compatibility driver for XP. nVidia has some issues with DirectX, they are mostly OpenGL cards (non-Windows Standard video stuff).
I also doubt there's much wrong with your Motherboard, usually you can tell. If there is heating issues with your CPU or you have memory frequency issues then something is usually wrong with it.
I looked up that board, and some things you might want to check is: The jumper settings, there is a jumper setting on the board to limit the frequency of the ram, check out your book for that and see if it's set to default or not. Secondly, if your board has RAID make sure you're not hooked to that IDE port, unless you specifically set up RAID when you installed windows (you'd need 2 hard drives to do that).
Other then that . . . If you can't fix it, you can try deleting your Windows Partition (in DOS using fdisk before windows boots) and re-installing windows. Oh, one more thing you should check is your format, fat or ntfs. if its fat, you might want to go ahead and back up what you can and re-install it all after re-installing windows.
That's about all I can give without seeing the actual computer.
I'm sure there's a way to fix the problems without re-installing Windows, it would just take way too much time to do, and probably wouldn't be worth it.
I hope that all helps. try looking on some forums like this one here:
computing.net