Civ keeps locking up, I don't get any error but I have to reboot. Nvidia 7800GT running in SLI mod on an AMD 2400mhz dualcore, latest drivers all around, and DX9.0c. Anyone have any suggestions?

Event Type: Error
Event Source: Application Error
Event Category: None
Event ID: 1000
Date: 10/2/2006
Time: 9:51:22 PM
User: N/A
Computer: ASPIRE
Description:
Faulting application civilization4.exe, version 1.6.1.1841, faulting module civilization4.exe, version 1.6.1.1841, fault address 0x00410081.

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Data:
0000: 41 70 70 6c 69 63 61 74 Applicat
0008: 69 6f 6e 20 46 61 69 6c ion Fail
0010: 75 72 65 20 20 63 69 76 ure civ
0018: 69 6c 69 7a 61 74 69 6f ilizatio
0020: 6e 34 2e 65 78 65 20 31 n4.exe 1
0028: 2e 36 2e 31 2e 31 38 34 .6.1.184
0030: 31 20 69 6e 20 63 69 76 1 in civ
0038: 69 6c 69 7a 61 74 69 6f ilizatio
0040: 6e 34 2e 65 78 65 20 31 n4.exe 1
0048: 2e 36 2e 31 2e 31 38 34 .6.1.184
0050: 31 20 61 74 20 6f 66 66 1 at off
0058: 73 65 74 20 30 30 34 31 set 0041
0060: 30 30 38 31 0d 0a 0081..