请高手指点，帮忙找出关键位置！出错，断下后哪里是关键？
点击导出QQ，出错后返回，来到这里，不知道哪里是关键！请高手分析一下，哪里是关键代码！
00454AA0 . 83EC 64 sub esp, 64
00454AA3 . 56 push esi
00454AA4 . 8B7424 74 mov esi, dword ptr [esp+74]
00454AA8 . 57 push edi
00454AA9 . 8B7E 08 mov edi, dword ptr [esi+8]
00454AAC . 57 push edi
00454AAD . E8 5E650100 call 0046B010
00454AB2 . 83C4 04 add esp, 4
00454AB5 . 85C0 test eax, eax
00454AB7 . 74 10 je short 00454AC9
00454AB9 . 8D4424 08 lea eax, dword ptr [esp+8]
00454ABD . 50 push eax
00454ABE . 56 push esi
00454ABF . E8 ACDEFFFF call 00452970
00454AC4 . 83C4 08 add esp, 8
00454AC7 . EB 42 jmp short 00454B0B
00454AC9 > 81FF 04000080 cmp edi, 80000004 ; Switch (cases 80000002..80000004)
00454ACF . 75 04 jnz short 00454AD5
00454AD1 . 8B0E mov ecx, dword ptr [esi] ; Case 80000004 (SINGLE STEP) of switch 00454AC9
00454AD3 . EB 3A jmp short 00454B0F
00454AD5 > 81FF 02000080 cmp edi, 80000002
00454ADB . 75 12 jnz short 00454AEF
00454ADD . 8B16 mov edx, dword ptr [esi] ; Case 80000002 (DATATYPE MISALIGNMENT) of switch 00454AC9
00454ADF . 8D4C24 08 lea ecx, dword ptr [esp+8]
00454AE3 . 51 push ecx
00454AE4 . 52 push edx
00454AE5 . E8 D6400200 call 00478BC0
00454AEA . 83C4 08 add esp, 8
00454AED . EB 1C jmp short 00454B0B
00454AEF > 81FF 03000080 cmp edi, 80000003
00454AF5 . 75 1C jnz short 00454B13
00454AF7 . 8B4E 04 mov ecx, dword ptr [esi+4] ; Case 80000003 (BREAKPOINT) of switch 00454AC9
00454AFA . 8B16 mov edx, dword ptr [esi]
00454AFC . 8D4424 08 lea eax, dword ptr [esp+8]
00454B00 . 50 push eax
00454B01 . 51 push ecx
00454B02 . 52 push edx
00454B03 . E8 F8390200 call 00478500
00454B08 . 83C4 0C add esp, 0C
00454B0B > 8D4C24 08 lea ecx, dword ptr [esp+8]
00454B0F > 85C9 test ecx, ecx
00454B11 . 75 09 jnz short 00454B1C
00454B13 > C64424 08 00 mov byte ptr [esp+8], 0 ; Default case of switch 00454AC9
00454B18 . 8D4C24 08 lea ecx, dword ptr [esp+8]
00454B1C > 8B46 20 mov eax, dword ptr [esi+20]
00454B1F . BA F0727600 mov edx, 007672F0
00454B24 . 85C0 test eax, eax
00454B26 . 74 03 je short 00454B2B
00454B28 . 8B56 18 mov edx, dword ptr [esi+18]
00454B2B > 8B46 0C mov eax, dword ptr [esi+C]
00454B2E . 8BF0 mov esi, eax
00454B30 . F7D6 not esi
00454B32 . 81E6 00100000 and esi, 1000
00454B38 . 8D0470 lea eax, dword ptr [eax+esi*2]
00454B3B . 50 push eax ; /Style
00454B3C . 52 push edx ; |Title
00454B3D . 51 push ecx ; |Text
00454B3E . 6A 00 push 0 ; |hOwner = NULL
00454B40 . FF15 E8E64F00 call dword ptr [<&USER32.MessageBoxA>>; \MessageBoxA
00454B46 . 5F pop edi
00454B47 . 83F8 03 cmp eax, 3 ; Switch (cases 2..7)
00454B4A . 5E pop esi
00454B4B . 75 0F jnz short 00454B5C
00454B4D . 8B4C24 68 mov ecx, dword ptr [esp+68] ; Case 3 of switch 00454B47
00454B51 . B8 02000000 mov eax, 2
00454B56 . 8901 mov dword ptr [ecx], eax
00454B58 . 83C4 64 add esp, 64
00454B5B . C3 retn
00454B5C > 83F8 02 cmp eax, 2
00454B5F . 75 0F jnz short 00454B70
00454B61 . 8B5424 68 mov edx, dword ptr [esp+68] ; Case 2 of switch 00454B47
00454B65 . B8 01000000 mov eax, 1
00454B6A . 8902 mov dword ptr [edx], eax
00454B6C . 83C4 64 add esp, 64
00454B6F . C3 retn
00454B70 > 83F8 05 cmp eax, 5
00454B73 . 75 0F jnz short 00454B84
00454B75 . 8B4C24 68 mov ecx, dword ptr [esp+68] ; Case 5 of switch 00454B47
00454B79 . B8 04000000 mov eax, 4
00454B7E . 8901 mov dword ptr [ecx], eax
00454B80 . 83C4 64 add esp, 64
00454B83 . C3 retn
00454B84 > 83F8 07 cmp eax, 7
00454B87 . 75 0F jnz short 00454B98
00454B89 . 8B5424 68 mov edx, dword ptr [esp+68] ; Case 7 of switch 00454B47
00454B8D . B8 06000000 mov eax, 6
00454B92 . 8902 mov dword ptr [edx], eax
00454B94 . 83C4 64 add esp, 64
00454B97 . C3 retn
00454B98 > 83F8 06 cmp eax, 6
00454B9B . 75 0F jnz short 00454BAC
00454B9D . 8B4C24 68 mov ecx, dword ptr [esp+68] ; Case 6 of switch 00454B47
00454BA1 . B8 05000000 mov eax, 5
00454BA6 . 8901 mov dword ptr [ecx], eax
00454BA8 . 83C4 64 add esp, 64
00454BAB . C3 retn
00454BAC > 33D2 xor edx, edx ; Default case of switch 00454B47
00454BAE . 8B4C24 68 mov ecx, dword ptr [esp+68]
00454BB2 . 83F8 04 cmp eax, 4
00454BB5 . 0F95C2 setne dl
00454BB8 . 4A dec edx
00454BB9 . 83E2 03 and edx, 3
00454BBC . 8BC2 mov eax, edx
00454BBE . 8901 mov dword ptr [ecx], eax
00454BC0 . 83C4 64 add esp, 64
00454BC3 . C3 retn
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