I am getting the following message:

Vegas Movie Studio Platinum 9.0
Version 9.0b (Build 92)
Exception 0xC0000005 (access violation) READ:0x49B0000 IP:0x6972CCDA
In Module 'QuickTime.qts' at Address 0x69610000 + 0x11CCDA
Thread: ProgMan ID=0x1510 Stack=0x5C1E000-0x5C20000
Registers:
EAX=049b2b5c CS=001b EIP=6972ccda EFLGS=00210206
EBX=00000000 SS=0023 ESP=05c1e6d4 EBP=05c1e6dc
ECX=00000ad7 DS=0023 ESI=049b0000 FS=003b
EDX=00000000 ES=0023 EDI=0caa1244 GS=0000
Bytes at CS:EIP:
6972CCDA: F3 A5 FF 24 95 F4 CD 72 .....r
6972CCE2: 69 90 8B C7 BA 03 00 00 i.......
Stack Dump:
05C1E6D4: 05C1E72C 05B20000 + FE72C
05C1E6D8: 05C1E700 05B20000 + FE700
05C1E6DC: 05C1E718 05B20000 + FE718
05C1E6E0: 69679F84 69610000 + 69F84 (QuickTime.qts)
05C1E6E4: 0CAA0B70 0C830000 + 270B70
05C1E6E8: 049AF92C 04940000 + 6F92C
05C1E6EC: 00003230
05C1E6F0: 696A85AF 69610000 + 985AF (QuickTime.qts)
05C1E6F4: 049AF92C 04940000 + 6F92C
05C1E6F8: 0CAA0B70 0C830000 + 270B70
05C1E6FC: 00003230
05C1E700: 04A0DD44 04940000 + CDD44
05C1E704: 00003230
05C1E708: 0000000C
05C1E70C: 69679F90 69610000 + 69F90 (QuickTime.qts)
05C1E710: 69803F75 69610000 + 1F3F75 (QuickTime.qts)
> 05C1E71C: 69803FA6 69610000 + 1F3FA6 (QuickTime.qts)
> 05C1E73C: 697D8DA6 69610000 + 1C8DA6 (QuickTime.qts)
> 05C1E778: 697D93F8 69610000 + 1C93F8 (QuickTime.qts)
> 05C1E7B4: 75647461 75560000 + E7461 (CRYPT32.dll)
> 05C1E7B8: 697DAB3D 69610000 + 1CAB3D (QuickTime.qts)
> 05C1E7F0: 75647461 75560000 + E7461 (CRYPT32.dll)
> 05C1E7F4: 697DABDA 69610000 + 1CABDA (QuickTime.qts)
> 05C1E818: 696A8226 69610000 + 98226 (QuickTime.qts)
> 05C1E858: 697DABA0 69610000 + 1CABA0 (QuickTime.qts)
> 05C1E860: 77419834 77410000 + 9834 (ntdll.dll)
> 05C1E870: 6972B2B0 69610000 + 11B2B0 (QuickTime.qts)
> 05C1E880: 34FCDCBE 34EA0000 + 12DCBE (qt7plug.dll)
> 05C1E8A8: 34EBB7DD 34EA0000 + 1B7DD (qt7plug.dll)
> 05C1E8E0: 34EBC9C0 34EA0000 + 1C9C0 (qt7plug.dll)
> 05C1E924: 34EC35A4 34EA0000 + 235A4 (qt7plug.dll)
> 05C1E938: 34EBD36C 34EA0000 + 1D36C (qt7plug.dll)
> 05C1E944: 75647461 75560000 + E7461 (CRYPT32.dll)
> 05C1E948: 75647461 75560000 + E7461 (CRYPT32.dll)
> 05C1EA1C: 00A9005B 00400000 + 69005B (VegasMovieStudioPE90.exe)
> 05C1EA20: 00720075 00400000 + 320075 (VegasMovieStudioPE90.exe)
> 05C1EA24: 005D006C 00400000 + 1D006C (VegasMovieStudioPE90.exe)
05C1EA28: 05C10000 05B20000 + F0000
05C1EA2C: 00000001
05C1EA30: 05C1EA40 05B20000 + FEA40
05C1EA34: 0C8ADE68 0C830000 + 7DE68
> 05C1EA48: 34EBD689 34EA0000 + 1D689 (qt7plug.dll)
> 05C1EA64: 35019630 34EA0000 + 179630 (qt7plug.dll)
> 05C1EA70: 0055005C 00400000 + 15005C (VegasMovieStudioPE90.exe)
> 05C1EA74: 00650073 00400000 + 250073 (VegasMovieStudioPE90.exe)
> 05C1EA78: 00730072 00400000 + 330072 (VegasMovieStudioPE90.exe)
- - -
05C1FFF0: 00000000
05C1FFF4: 005282F0 00400000 + 1282F0 (VegasMovieStudioPE90.exe)
05C1FFF8: 00AF3D58 00400000 + 6F3D58 (VegasMovieStudioPE90.exe)
05C1FFFC: 00000000


WHY?????????????????
How Can I fix this????????
Sometimes the file will open but as I work in it the error will pop up again.......... I have up dated Quick time and Sony Vegas 9.......... I have made sevaral videos before and not had a problem using the same camera and video clips my clips look to be MOV. ANY HEP PLEASE????????