Every time I try to render this video, I get an error message (below) and then Vegas immediately shuts down. The pop up originally says something like "Cannot render the video, an exception has occurred." Any ideas??

Sony Vegas 5.0
Version 5.0a (Build 134)
Exception 0xC0000005 (access violation) READ:0x0 IP:0x0
In Module 'vegas50.exe' at Address 0x0 + 0x0
Thread: ProgMan ID=0x658 Stack=0x310F000-0x3110000
Registers:
EAX=007dac08 CS=001b EIP=00000000 EFLGS=00210282
EBX=02183ce0 SS=0023 ESP=0310fa08 EBP=02ab4ba4
ECX=02ab4bd8 DS=0023 ESI=02ab494c FS=003b
EDX=00200000 ES=0023 EDI=02ab48b8 GS=0000
Bytes at CS:EIP:
00000000: .. .. .. .. .. .. .. .. ........
00000008: .. .. .. .. .. .. .. .. ........
Stack Dump:
0310FA08: 011D8F5F 01000000 + 1D8F5F (vegas50k.dll)
0310FA0C: 02AB4BD8 02AA0000 + 14BD8
0310FA10: 00000000
0310FA14: 007DAC08 00400000 + 3DAC08 (vegas50.exe)
0310FA18: 00000000
0310FA1C: 00000000
0310FA20: 00000000
0310FA24: 00000000
0310FA28: 00000000
0310FA2C: 8000FFFF
0310FA30: 038A2088 03830000 + 72088
0310FA34: 021834C8 020E0000 + A34C8
0310FA38: 02AB48B8 02AA0000 + 148B8
0310FA3C: 0067FEA1 00400000 + 27FEA1 (vegas50.exe)
0310FA40: 8007000E
0310FA44: 005F7DD0 00400000 + 1F7DD0 (vegas50.exe)
> 0310FA4C: 007DAC08 00400000 + 3DAC08 (vegas50.exe)
0310FA50: FFFFFFFF
0310FA54: 038A2088 03830000 + 72088
0310FA58: 02B2DB58 02AA0000 + 8DB58
0310FA5C: 00000000
> 0310FA60: 006801AC 00400000 + 2801AC (vegas50.exe)
- - -
0310FFF0: 00000000
0310FFF4: 004FA320 00400000 + FA320 (vegas50.exe)
0310FFF8: 007DF9C8 00400000 + 3DF9C8 (vegas50.exe)
0310FFFC: 00000000