AVG AS 7.5 crashes when running

Can someone suggest why I might be crashing AVG AS 7.5 when I run it on my box?? HijackThis runs fine but finds nothing. "AdAware" and "cleanup" also crash when running. "Ccleaner" runs fine (both scan and issues). My problem is that something has hijacked my Google search results, and re-directs me whenever I click on the "titled" search result. The redirection takes me to many different places (pharmacies/search engines/education places). Here's the AVG error file. THANK YOU VERY MUCH!!!

//==<AVG AntiSpyware 7.5.0.50>===================================
Exception code: C0000005 ACCESS_VIOLATION
Fault address: 39392D44 <pages range base not found>
Exception Date: 01/16/2007 08:05:08
File Version of C:\Program Files\Grisoft\AVG Anti-Spyware 7.5\avgas.exe: 7.5.0.50

MiniDump Information Saved to .dmp

Registers:
EAX:00000000
EBX:01F30000
ECX:7C91056D
EDX:00000000
ESI:7C80DDF5
EDI:00000066
CS:EIP:001B:39392D44
SS:ESP:0023:039D825C EBP:36444341
DS:0023 ES:0023 FS:003B GS:0000
Flags:00010246

Intel specific method

Call stack:
Address Frame Param 0 Param 1 Param 2 Param 3 Logical addr Module
39392D44 36444341 <frame 36444341 not readable>

ImageHelp specific method

Call stack:
Address Frame Param 0 Param 1 Param 2 Param 3 Symbol/Logical address
39392D44 039D8258 2D424445 31374642 3435302D 38393841 <pages range base not found>
342D4532 36444341 00000000 00000000 00000000 00000000 <pages range base not found>

Loaded Modules:
Base Size Module
00400000 605000 7.05.0000.0050 C:\Program Files\Grisoft\AVG Anti-Spyware 7.5\avgas.exe
7C900000 0B0000 5.01.2600.2180 C:\WINDOWS\system32\ntdll.dll
7C800000 0F4000 5.01.2600.2945 C:\WINDOWS\system32\kernel32.dll
76BF0000 00B000 5.01.2600.2180 C:\WINDOWS\system32\PSAPI.DLL
10000000 0DD000 4.02.0000.0015 C:\Program Files\Grisoft\AVG Anti-Spyware 7.5\engine.dll
76780000 009000 6.00.2900.2180 C:\WINDOWS\system32\SHFOLDER.dll
77C10000 058000 7.00.2600.2180 C:\WINDOWS\system32\msvcrt.dll
77DD0000 09B000 5.01.2600.2180 C:\WINDOWS\system32\ADVAPI32.dll
77E70000 091000 5.01.2600.2180 C:\WINDOWS\system32\RPCRT4.dll
77F60000 076000 6.00.2900.2995 C:\WINDOWS\system32\SHLWAPI.dll
77F10000 047000 5.01.2600.2818 C:\WINDOWS\system32\GDI32.dll
77D40000 090000 5.01.2600.2622 C:\WINDOWS\system32\USER32.dll
76B40000 02D000 5.01.2600.2180 C:\WINDOWS\system32\WINMM.dll
76380000 005000 5.01.2600.2180 C:\WINDOWS\system32\MSIMG32.dll
763B0000 049000 6.00.2900.2180 C:\WINDOWS\system32\comdlg32.dll
773D0000 103000 6.00.2900.2982 C:\WINDOWS\WinSxS\X86_Microsoft.Windows.Common-Controls_6595b64144ccf1df_6.0.2600.2982_x-ww_ac3f9c03\COMCTL32.dll
7C9C0000 815000 6.00.2900.2951 C:\WINDOWS\system32\SHELL32.dll
774E0000 13D000 5.01.2600.2726 C:\WINDOWS\system32\ole32.dll
71AD0000 009000 5.01.2600.2180 C:\WINDOWS\system32\WSOCK32.dll
71AB0000 017000 5.01.2600.2180 C:\WINDOWS\system32\WS2_32.dll
71AA0000 008000 5.01.2600.2180 C:\WINDOWS\system32\WS2HELP.dll
76D60000 019000 5.01.2600.2912 C:\WINDOWS\system32\iphlpapi.dll
77C00000 008000 5.01.2600.2180 C:\WINDOWS\system32\VERSION.dll
77120000 08C000 5.01.2600.2180 C:\WINDOWS\system32\OLEAUT32.dll
771B0000 0A9000 6.00.2900.2995 C:\WINDOWS\system32\WININET.dll
77A80000 094000 5.131.2600.2180 C:\WINDOWS\system32\CRYPT32.dll
77B20000 012000 5.01.2600.2180 C:\WINDOWS\system32\MSASN1.dll
7E1E0000 0A2000 6.00.2900.2995 C:\WINDOWS\system32\urlmon.dll
5AD70000 038000 6.00.2900.2180 C:\WINDOWS\system32\uxtheme.dll
74720000 04B000 5.01.2600.2180 C:\WINDOWS\system32\MSCTF.dll
77B40000 022000 5.01.2600.2180 C:\WINDOWS\system32\appHelp.dll
76FD0000 07F000 2001.12.4414.0308 C:\WINDOWS\system32\CLBCATQ.DLL
77050000 0C5000 2001.12.4414.0258 C:\WINDOWS\system32\COMRes.dll
77A20000 054000 5.01.2600.2180 C:\WINDOWS\System32\cscui.dll
76600000 01D000 5.01.2600.2180 C:\WINDOWS\System32\CSCDLL.dll
77920000 0F3000 5.01.2600.2180 C:\WINDOWS\system32\SETUPAPI.dll
77760000 170000 6.00.2900.2987 C:\WINDOWS\system32\shdocvw.dll
754D0000 080000 5.131.2600.2180 C:\WINDOWS\system32\CRYPTUI.dll
76C30000 02E000 5.131.2600.2180 C:\WINDOWS\system32\WINTRUST.dll
76C90000 028000 5.01.2600.2180 C:\WINDOWS\system32\IMAGEHLP.dll
5B860000 054000 5.01.2600.2976 C:\WINDOWS\system32\NETAPI32.dll
76F60000 02C000 5.01.2600.2180 C:\WINDOWS\system32\WLDAP32.dll
605D0000 009000 5.01.2600.2180 C:\WINDOWS\system32\mslbui.dll
71A50000 03F000 5.01.2600.2180 C:\WINDOWS\system32\mswsock.dll
662B0000 058000 5.01.2600.2180 C:\WINDOWS\system32\hnetcfg.dll
71A90000 008000 5.01.2600.2180 C:\WINDOWS\System32\wshtcpip.dll
76F20000 027000 5.01.2600.2938 C:\WINDOWS\system32\DNSAPI.dll
76FB0000 008000 5.01.2600.2180 C:\WINDOWS\System32\winrnr.dll
76FC0000 006000 5.01.2600.2938 C:\WINDOWS\system32\rasadhlp.dll
59A60000 0A1000 5.01.2600.2180 C:\WINDOWS\system32\DBGHELP.DLL