Sarah,

Doom 3 has quite a few system requirements. I'm borrowing from one of John Robie's posts here, but there are suggestions for various cards and system requirements:
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Some of the Doom 3 computer requirements as taken from the game CD "Read Me" which are higher than any other game I have to date:

Quote:
"Please note that Doom 3 does not support Microsoft(r) Windows(r)
95/98/ME/NT. However, installation is allowed in case of operating
system upgrades, or dual booting configurations.

1. Minimum System Requirements:

* English version of Microsoft(r) Windows(r) 2000/XP

* Pentium(r) 4 1.5 GHz or Athlon(tm) XP 1500+ processor