Might be lack of sufficient hardware. Please post a dxdiag:
Start - Run (if Vista, the search box acts like Run) - type dxdiag - hit Enter - "save all info" button - open txt file and copy/paste EVERYTHING here
Picture of process: http://www.windowsresource.net/cimages/gotodxdiag.jpg
I can't see it being a hardware problem, considering I've played many hours of the game. It's just that it won't work now that I've reinstalled it. I've gotten it to work on startup by running XP comp, turning off visual themes, and running as admin. But now it crashes whenever I get to the part where the Emperor's guard get attacked for the first time. Ugghhh
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System Information
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Time of this report: 5/9/2011, 16:47:43
       Machine name: GARRETT-PC
   Operating System: Windows Vista? Home Premium (6.0, Build 6001) Service Pack 1 (6001.longhorn_rtm.080118-1840)
           Language: English (Regional Setting: English)
System Manufacturer: eMachines
       System Model: EL1210-09
               BIOS: )Phoenix - Award WorkstationBIOS v6.00PG
          Processor: AMD Athlon Processor LE-1620, ~2.4GHz
             Memory: 1790MB RAM
          Page File: 1835MB used, 1996MB available
        Windows Dir: C:\Windows
    DirectX Version: DirectX 10
DX Setup Parameters: Not found
     DxDiag Version: 6.00.6001.18000 32bit Unicode
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DxDiag Notes
------------
      Display Tab 1: No problems found.
        Sound Tab 1: No problems found.
        Sound Tab 2: No problems found.
        Sound Tab 3: No problems found.
          Input Tab: No problems found.
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DirectX Debug Levels
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Direct3D:    0/4 (retail)
DirectDraw:  0/4 (retail)
DirectInput: 0/5 (retail)
DirectMusic: 0/5 (retail)
DirectPlay:  0/9 (retail)
DirectSound: 0/5 (retail)
DirectShow:  0/6 (retail)
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Display Devices
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        Card name: NVIDIA GeForce 8200 
     Manufacturer: NVIDIA
        Chip type: GeForce 8200
         DAC type: Integrated RAMDAC
       Device Key: Enum\PCI\VEN_10DE&DEV_084B&SUBSYS_01531025&REV_A2
   Display Memory: 882 MB
 Dedicated Memory: 243 MB
    Shared Memory: 639 MB
     Current Mode: 1024 x 768 (32 bit) (60Hz)
          Monitor: Generic PnP Monitor
      Driver Name: nvd3dum.dll,nvwgf2um.dll
   Driver Version: 7.15.0011.7530 (English)
      DDI Version: 10