I have created a 55 minute movie (have done this before) with quite a few still pics and some hd video. I have spent the past 15 hours trying to render the movie, and it crashes every time. Here is the error message I am getting:

Sony Vegas Movie Studio Platinum 7.0
Version 7.0a (Build 52)
Exception 0xC0000005 (access violation) READ:0x448 IP:0x669906
In Module 'VegasMovieStudioPE70.exe' at Address 0x400000 + 0x269906
Thread: ProgMan ID=0x4DC Stack=0xAA6D000-0xAA70000
Registers:
EAX=00000000 CS=001b EIP=00669906 EFLGS=00010246
EBX=00000000 SS=0023 ESP=0aa6d57c EBP=0b586a70
ECX=00000000 DS=0023 ESI=00000000 FS=003b
EDX=72b70000 ES=0023 EDI=00212d28 GS=0000
Bytes at CS:EIP:
00669906: 8B 81 48 04 00 00 74 52 ..H...tR
0066990E: 85 C0 53 56 57 8B B9 4C ..SVW..L
Stack Dump:
0AA6D57C: 0068063C 00400000 + 28063C (VegasMovieStudioPE70.exe)
0AA6D580: 00000000
0AA6D584: 00000000
0AA6D588: 00000000
0AA6D58C: 0AA6D628 0A970000 + FD628
0AA6D590: 017B73D0 01550000 + 2673D0
0AA6D594: 00000000
0AA6D598: 0B5B5614 0B490000 + 125614
0AA6D59C: 72B70000 72B70000 + 0
0AA6D5A0: 00000000
0AA6D5A4: 00000000
0AA6D5A8: 0AA6D628 0A970000 + FD628
0AA6D5AC: 017B73D0 01550000 + 2673D0
0AA6D5B0: 00000000
0AA6D5B4: 0B597B94 0B490000 + 107B94
0AA6D5B8: 72A10000 72A10000 + 0
> 0AA6D668: 00675D59 00400000 + 275D59 (VegasMovieStudioPE70.exe)
0AA6D66C: 72B70000 72B70000 + 0
0AA6D670: 0B5B5610 0B490000 + 125610
0AA6D674: 0016DC90 00150000 + 1DC90
0AA6D678: 72A10000 72A10000 + 0
> 0AA6D694: 00676C96 00400000 + 276C96 (VegasMovieStudioPE70.exe)
0AA6D698: 15DD0FF0 15670000 + 760FF0
0AA6D69C: 00212D28 00150000 + C2D28
0AA6D6A0: 0B58D8D8 0B490000 + FD8D8
0AA6D6A4: 00000000
> 0AA6D6AC: 00676C48 00400000 + 276C48 (VegasMovieStudioPE70.exe)
0AA6D6B0: 0B58D8D8 0B490000 + FD8D8
0AA6D6B4: 00212D28 00150000 + C2D28
0AA6D6B8: 0B9C0E10 0B6E0000 + 2E0E10
0AA6D6BC: 0B9C9748 0B6E0000 + 2E9748
> 0AA6D6C8: 00676D55 00400000 + 276D55 (VegasMovieStudioPE70.exe)
0AA6D6CC: 0B9C97B0 0B6E0000 + 2E97B0
0AA6D6D0: 00212D28 00150000 + C2D28
0AA6D6D4: 0B9C9748 0B6E0000 + 2E9748
0AA6D6D8: 0B9C0E10 0B6E0000 + 2E0E10
> 0AA6D6EC: 00676DFC 00400000 + 276DFC (VegasMovieStudioPE70.exe)
- - -
0AA6FFF0: 00000000
0AA6FFF4: 0050CC20 00400000 + 10CC20 (VegasMovieStudioPE70.exe)
0AA6FFF8: 009AF3D0 00400000 + 5AF3D0 (VegasMovieStudioPE70.exe)
0AA6FFFC: 00000000

I don't understand what this means, and I'm not too wise when it comes to editing video. Can anyone tell me what I might be doing wrong and how I may correct it?

Any help is greatly appreciated. I'm about to just give up.