PC Hardware not detected

ok. i have looked through the forums and did not see a thread for this so i figured i would ask. if it is asked elsewhere, then i will admit i did not see it.

i have been playing FFXI on the xbox for about 2 - 3 months now. a few friends of mine suggested i get the expansions also since i really enjoyed the game. i did purchase it for the PC digital download until i can get the disk for XBOX 360. i have all expansion and updates (including the 6 hr expansion updates) but when i run it on my PC, it starts up fine but when i hit play, it say hardware not recognized (code -1).

this PC is a Dimension 2350. (still working on my custom PC at the moment). this is the PC i am running at the moment but i figured it would work

Operating System
MS Windows XP Professional 32-bit SP3
CPU
Intel Pentium 4
Northwood 0.13um Technology
RAM
768 MB DDR @ 132MHz (2.5-3-3-6)
Motherboard
Dell Computer Corporation 07W080 (Socket 478)
Graphics
TF-TV2425 (1024x768@70Hz)
Intel(R) 82845G/GL/GE/PE/GV Graphics Controller
Hard Drives
78GB Western Digital WDC WD800BB-75FJA1 (PATA) 33 °C
Optical Drives
PHILIPS DVD+-RW DVD8701
SAMSUNG CD-R/RW SW-248F
Audio
Unimodem Half-Duplex Audio Device

if someone could help me or point me in the right direction, it would be greatly appreciated. thank you.