Each time I try to make a movie, my Vegas 9 crashes, completely shutting down. When I try to render, I get an error after about 15 seconds of rendering. I tried several times with .mp4 and .wmv/.wma formats even going to the smallest format available, and tried the default.

I have also shut down all other programs. Here is my PC information:
Operating System
Platform: Windows Vista
Version: 6.01.7601 (Service Pack 1)
Language: English
System locale: English
User locale: English

Processor
Class: Intel(R) Core(TM) i7 CPU 950 @ 3.07GHz
Identifier: GenuineIntel
Number of processors: 8
MMX available: Yes
SSE available: Yes
SSE2 available: Yes
SSE3 available: Yes

Display
Primary: 1920x1080x32

Memory
Physical memory: 4,194.3 MB
Paging memory available: 4,194.3 MB
Virtual memory possible: 2,097.0 MB


Here is the error code. Can you tell me what is wrong?

AN ERROR OCCURRED DURING THE CURRENT OPERATION. AN EXCEPTION HAS OCCURRED.

Vegas Movie Studio HD 9.0
Version 9.0c (Build 30)
Exception 0xC0000005 (access violation) READ:0x0 IP:0x74CA500A
In Module 'MSVCR80.dll' at Address 0x74C90000 + 0x1500A
Thread: ProgMan ID=0x247C Stack=0x448F000-0x4490000
Registers:
EAX=002a3000 CS=0023 EIP=74ca500a EFLGS=00210212
EBX=00000000 SS=002b ESP=0448f4ec EBP=0448f4f4
ECX=000a8c00 DS=002b ESI=00000000 FS=0053
EDX=00000000 ES=002b EDI=7e9e00a8 GS=002b
Bytes at CS:EIP:
74CA500A: F3 A5 FF 24 95 24 51 CA ...: 74 90 8B C7 BA 03 00 00 t.......
Stack Dump:
0448F4EC: 00000000
0448F4F0: 3E071230 3D7E0000 + 891230
0448F4F4: 0448F868 04390000 + FF868
0448F4F8: 5F5F74FA 5F5E0000 + 174FA (wmfplug4.dll)
0448F4FC: 7E9E00A8 7E9E0000 + A8
0448F500: 00000000
0448F504: 002A3000 00260000 + 43000
0448F508: C89ED6EE
0448F50C: 3DB88750 3D7E0000 + 3A8750
0448F510: 3E07093C 3D7E0000 + 89093C
0448F514: 3E070908 3D7E0000 + 890908
0448F518: 33564D57 33520000 + 44D57
0448F51C: 004D11D8 00400000 + D11D8 (VegasMovieStudioHD90.exe)
0448F520: 00000001
0448F524: 00000007
0448F528: 00000500
> 0448F55C: 00500000 00400000 + 100000 (VegasMovieStudioHD90.exe)
0448F560: 00000000
0448F564: 00000000
0448F568: 00000064
0448F56C: 00000000
> 0448F59C: 00610070 00400000 + 210070 (VegasMovieStudioHD90.exe)
0448F5A0: 00000080
> 0448F5A4: 0061004E 00400000 + 21004E (VegasMovieStudioHD90.exe)
> 0448F5A8: 0065006D 00400000 + 25006D (VegasMovieStudioHD90.exe)
0448F5AC: 3DB80000 3D7E0000 + 3A0000
0448F5B0: 3E0E7128 3D7E0000 + 907128
0448F5B4: 00000000
0448F5B8: 02000002 01980000 + 680002
> 0448F610: 76B7AC9D 76AE0000 + 9AC9D (WININET.dll)
> 0448F618: 778371D5 777C0000 + 771D5 (ntdll.dll)
> 0448F624: 777F3CC3 777C0000 + 33CC3 (ntdll.dll)
> 0448F628: 777F3CEE 777C0000 + 33CEE (ntdll.dll)
> 0448F63C: 00788936 00400000 + 388936 (VegasMovieStudioHD90.exe)
- - -
0448FFF0: 00000000
0448FFF4: 00528730 00400000 + 128730 (VegasMovieStudioHD90.exe)
0448FFF8: 00AF4D58 00400000 + 6F4D58 (VegasMovieStudioHD90.exe)
0448FFFC: 00000000