Re: Oblivion troubles
The card works with Oblivion, but it just makes it. Your card is only GDDR2 with 256mb RAM which is pretty low for gaming. You can also tell it's old (not slow though) because it uses an AGP slot. Most new cards today use PCI-E.
I suggest upgrading your card a little, to something like NVIDIA 7600+ or something.
Preferably something that has 512mb or higher.