Ok strange one here, install Spitfire and accusim. Select Spitfire and fly, no problems, well at least not computer ones

. then if I go back to the FSX and try loading any WOP3 spitfire I get the error and reloads FSX. If I reinstall again I get one go at the aircraft again but the second selection goes and crashes FSX.
When I select the aircraft from the free flight mwnu I get to see the aircraft "in primer" and it crashes before the paint scheme is shown. Does not matter if accusim is installed or not.
Not had this kind of error before and on restarting I can fly any aircraft but the WOP3 Spitfire.
Cheers Ron
Bits from the microsoft error which may (or may not) help you
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System Information
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Time of this report: 1/30/2011, 07:52:29
Machine name: DESKTOP
Operating System: Windows XP Home Edition (5.1, Build 2600) Service Pack 3 (2600.xpsp.080413-2111)
Language: English (Regional Setting: English)
System Manufacturer: Gigabyte Technology Co., Ltd.
System Model: M720-US3
BIOS: Award Modular BIOS v6.00PG
Processor: AMD Phenom(tm) 9950 Quad-Core Processor, MMX, 3DNow (4 CPUs), ~2.6GHz
Memory: 3070MB RAM
Page File: 920MB used, 6989MB available
Windows Dir: C:\WINDOWS
DirectX Version: DirectX 9.0c (4.09.0000.0904)
DX Setup Parameters: Not found
DxDiag Version: 5.03.2600.5512 32bit Unicode
DxDiag Previously: Crashed in system information (stage 4)
---------------
Display Devices
---------------
Card name: NVIDIA GeForce 9800 GT
Manufacturer: NVIDIA
Chip type: GeForce 9800 GT
DAC type: Integrated RAMDAC
Device Key: Enum\PCI\VEN_10DE&DEV_0605&SUBSYS_23721682&REV_A2
Display Memory: 512.0 MB
Current Mode: 1680 x 1050 (32 bit) (60Hz)
Monitor: Default Monitor
Monitor Max Res:
Driver Name: nv4_disp.dll
Driver Version: 6.14.0012.6658 (English)
DDI Version: 9 (or higher)
Driver Attributes: Final Retail
Driver Date/Size: 1/8/2011 03:27:00, 6397824 bytes
WHQL Logo'd: Yes
WHQL Date Stamp: n/a
VDD: n/a
Mini VDD: nv4_mini.sys
Mini VDD Date: 1/8/2011 03:27:00, 9888672 bytes
Device Identifier: {D7B71E3E-4545-11CF-306F-7E0303C2CB35}
Vendor ID: 0x10DE
Device ID: 0x0605
SubSys ID: 0x23721682
Revision ID: 0x00A2
Revision ID: 0x00A2
Video Accel: ModeMPEG2_C ModeMPEG2_D