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I had similar issues when I installed Dungeon Siege on my windows 7 x64 system. However my video card is Nvidia and not ATI. The issues I had where the images would flicker and at other times things where very dark where it was hard to tell what was happening. Can not remember if I was in the open, in a building or underground when things got dark and when things flickered.
This is what I did to resolve this issue, disable Hardware TnL and set the game to use blit mode.

To disable Hardware TnL: 1. Click Start, click Programs, click Dungeon Siege, click Troubleshooting, and then click Dungeon Siege Video Configuration Tool.
2. In the Video Driver drop down list, select "Primary Display Driver - Hardware" and make sure TnL is off.
3. Click OK.

To use blit mode: 1. Create a shortcut to the DungeonSiege.exe file.
2. Right-click the shortcut, and then click Properties.
3. In the Target field on the Shortcut tab, add the following at the end of the line: bltonly=true. The entire Target line would then read:
"C:\Program Files\Microsoft Games\Dungeon Siege\DungeonSiege.exe" bltonly=true

Not sure if this will help.

Shadow Watcher