Question Fable running X times faster than usual.

I'm on my Grandfather's computer, and I got him to install Fable: The Lost Chapters on his computer, and apparently, the game seems be running several times faster than normal. Here's his system info.

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System Information
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Time of this report: 1/20/2008, 21:35:24
Machine name: ANTHONY
Operating System: Windows XP Home Edition (5.1, Build 2600) Service Pack 2 (2600.xpsp_sp2_gdr.070227-2254)
Language: English (Regional Setting: English)
System Manufacturer: NVIDIA
System Model: NVDAACPI
BIOS: )Phoenix - Award WorkstationBIOS v6.00PG
Processor: AMD Athlon(tm) 64 X2 Dual Core Processor 5600+, MMX, 3DNow (2 CPUs), ~800MHz
Memory: 3006MB RAM
Page File: 368MB used, 4524MB available
Windows Dir: C:\WINDOWS
DirectX Version: DirectX 9.0c (4.09.0000.0904)
DX Setup Parameters: /PackageInstall
DxDiag Version: 5.03.2600.2180 32bit Unicode

If anyone has any ideas, please let me know. I have no idea if other games might do this, and my computer seems to run Fable just fine.