Need NVIDIA graphics chip...

Yes, I bought Final Fantasy XI.  With a newer computer, I figured I was safe.  Well, it turns out I'm not.  I cannot get it to run due to some TnL error...which I looked up, and to my absolute horror found that I needed to purchase a graphics card to get the stupid thing to run (as if I didn't shell out enough money for this game).  Does anyone....ANYONE know what version of this graphics card I need to get so I don't end up wasting the money I've spent for online registration any further than I already have?

And also, where can I purchase one?  Do I need someone to install it for me (if it requires more than sticking a CD in the CD-rom, then the answer to that would be "yes")?

Here is some system info if it helps any (I swiped it directly from my PlayOnline Viewer Config window):

=============================== System =================================

CPU = Intel(R) Pentium(R) 4 CPU 2.40GHz
CPU Speed = 2467 MHz
No. of CPUs = 1
OS = Microsoft Windows XP Service Pack 1 Ver 5.01.2600
Version of DirectX = DirectX 9.0
Main Memory = Capacity: 254MB : Free Space: 81MB
Drive [C:\] = Local Disk Free Space: 20.68 GB (Capacity: 38.25 GB )
Graphics Card = Intel(R) 82845G/GL/GE/PE/GV Graphics Controller
  Type of Chip = Unknown Video Chip
  Video Driver = ialmrnt5.dll
  Version = 6.13.10.3510
  Updated = 04/15/2003 11:40 AM
  VendorId = 0x8086
  DeviceId = 0x2562
  SubSysId = 0x1601028
  Revision = 1
  WHQLLevel = Signed(Date:Unknown)
  VRAM = 64.0MB
  AvailableVidMem = 6.0MB
  AvailableTextureMem = 51.0MB
Sound Card = SoundMAX Digital Audio
  Sound Driver = smwdm.sys
  Version = 5.12.01.3555
  Updated = 02/28/2003 10:17 AM
Network Card = Broadcom 440x 10/100 Integrated Controller
  Network Driver = bcm4sbxp.sys
  Version = 3.60.0.0
  Updated = 05/23/2003 01:58 PM
Motherboard = 0C2425
  Manufacturer = Dell Computer Corp.
  Version = A01
  Serial Number = ..CN137403B80077.