therefore, when i can't stand this annoying problem any more, i decided to find the problem (what a good habit of an engineer ... lazy XD). I found the NPSWF32.dll which decode flash clips leads the problem. the following is the dump message:
Executable search path is:
Windows 7 Version 7600 MP (2 procs) Free x86 compatible
Product: WinNt, suite: SingleUserTS
Debug session time: Mon Nov 23 09:31:38.000 2009 (GMT+8)
System Uptime: not available
Process Uptime: 0 days 0:00:41.000
...................................................................................................................
This dump file has an exception of interest stored in it.
The stored exception information can be accessed via .ecxr.
(ed8.11a4): Access violation - code c0000005 (first/second chance not available)
eax=001dde34 ebx=00000000 ecx=001ddc17 edx=772f64f4 esi=000000d4 edi=00000000
eip=772f64f4 esp=001ddba8 ebp=001ddc14 iopl=0 nv up ei pl zr na pe nc
cs=001b ss=0023 ds=0023 es=0023 fs=003b gs=0000 efl=00240246
ntdll!KiFastSystemCallRet:
772f64f4 c3 ret
0:000> .ecxr
eax=0e55a088 ebx=0000000c ecx=00000000 edx=00000080 esi=001de1ec edi=001de204
eip=6459ff60 esp=001de134 ebp=0e5ca800 iopl=0 nv up ei pl nz na po nc
cs=001b ss=0023 ds=0023 es=0023 fs=003b gs=0000 efl=00250202
*** ERROR: Symbol file could not be found. Defaulted to export symbols for NPSWF32.dll -
NPSWF32!native_ShockwaveFlash_TCallLabel+0xa4c2a:
6459ff60 8b4158 mov eax,dword ptr [ecx+58h] ds:0023:00000058=????????
as you could see, the ShockwareFlash is clear and obviously showing there, that is, the mruderer. I totally have no idea what is happening about the flash decoder. after i installed ff extension flash block, the world become beautiful again XD. if you meet the the problme as i met, you might try to block the flash on your firefox.
ps: i have 2 pc installed windows 7, but the flash on my home pc works very well, therefore, i can't get the idea of this problem.