OK, the AVG scan turned up no malware. Here's the Hijack This log:
Logfile of Trend Micro HijackThis v2.0.4
Scan saved at 5:44:59 PM, on 8/8/2010
Platform: Windows XP SP3 (WinNT 5.01.2600)
MSIE: Internet Explorer v8.00 (8.00.6001.18702)
Boot mode: Normal
Running processes:
C:\WINDOWS\System32\smss.exe
C:\WINDOWS\system32\winlogon.exe
C:\WINDOWS\system32\services.exe
C:\WINDOWS\system32\lsass.exe
C:\WINDOWS\system32\svchost.exe
C:\WINDOWS\System32\svchost.exe
C:\Program Files\AVG9\avgchsvx.exe
C:\Program Files\AVG9\avgrsx.exe
C:\Program Files\AVG9\avgcsrvx.exe
C:\WINDOWS\system32\spoolsv.exe
C:\Program Files\Common Files\Apple\Mobile Device Support\bin\AppleMobileDeviceService.exe
C:\Program Files\AVG9\avgwdsvc.exe
C:\Program Files\Common Files\Microsoft Shared\VS7DEBUG\MDM.EXE
C:\Program Files\AVG9\avgnsx.exe
C:\WINDOWS\Explorer.EXE
C:\PROGRA~1\AVG9\avgtray.exe
C:\Program Files\Mozilla Firefox\firefox.exe
C:\Program Files\NETGEAR\WG311v3\WG311v3.exe
C:\WINDOWS\system32\msiexec.exe
C:\Program Files\Trend Micro\HijackThis\HiJackThis.exe
R1 - HKCU\Software\Microsoft\Internet Explorer\Main,Default_Search_URL =
http://ie.redirect.hp.com/svs/rdr?TYPE=3&tp=iesearch&locale=EN_US&c=Q305&bd=pavilion&pf=desktop
R1 - HKCU\Software\Microsoft\Internet Explorer\Main,Search Bar =
http://ie.redirect.hp.com/svs/rdr?TYPE=3&tp=iesearch&locale=EN_US&c=Q305&bd=pavilion&pf=desktop
R1 - HKCU\Software\Microsoft\Internet Explorer\Main,Search Page =
http://ie.redirect.hp.com/svs/rdr?TYPE=3&tp=iesearch&locale=EN_US&c=Q305&bd=pavilion&pf=desktop
R1 - HKLM\Software\Microsoft\Internet Explorer\Main,Default_Page_URL =
http://go.microsoft.com/fwlink/?LinkId=69157
R1 - HKLM\Software\Microsoft\Internet Explorer\Main,Default_Search_URL =
http://go.microsoft.com/fwlink/?LinkId=54896
R1 - HKLM\Software\Microsoft\Internet Explorer\Main,Search Bar =
http://ie.redirect.hp.com/svs/rdr?TYPE=3&tp=iesearch&locale=EN_US&c=Q305&bd=pavilion&pf=desktop
R1 - HKLM\Software\Microsoft\Internet Explorer\Main,Search Page =
http://go.microsoft.com/fwlink/?LinkId=54896
R0 - HKLM\Software\Microsoft\Internet Explorer\Main,Start Page =
http://go.microsoft.com/fwlink/?LinkId=69157
R0 - HKLM\Software\Microsoft\Internet Explorer\Search,SearchAssistant =
http://ie.redirect.hp.com/svs/rdr?TYPE=3&tp=iesearch&locale=EN_US&c=Q305&bd=pavilion&pf=desktop
O2 - BHO: AcroIEHelperStub - {18DF081C-E8AD-4283-A596-FA578C2EBDC3} - C:\Program Files\Common Files\Adobe\Acrobat\ActiveX\AcroIEHelperShim.dll
O2 - BHO: WormRadar.com IESiteBlocker.NavFilter - {3CA2F312-6F6E-4B53-A66E-4E65E497C8C0} - C:\Program Files\AVG9\avgssie.dll
O2 - BHO: NCO 2.0 IE BHO - {602ADB0E-4AFF-4217-8AA1-95DAC4DFA408} - (no file)
O2 - BHO: Java(tm) Plug-In 2 SSV Helper - {DBC80044-A445-435b-BC74-9C25C1C588A9} - C:\Program Files\Java\jre6\bin\jp2ssv.dll
O3 - Toolbar: HP View - {B2847E28-5D7D-4DEB-8B67-05D28BCF79F5} - c:\Program Files\HP\Digital Imaging\bin\HPDTLK02.dll
O3 - Toolbar: (no name) - {7FEBEFE3-6B19-4349-98D2-FFB09D4B49CA} - (no file)
O4 - HKLM\..\Run: [AVG9_TRAY] C:\PROGRA~1\AVG9\avgtray.exe
O4 - HKLM\..\Run: [KernelFaultCheck] %systemroot%\system32\dumprep 0 -k
O4 - HKLM\..\Run: [Adobe Reader Speed Launcher] "C:\Program Files\Adobe\Reader 9.0\Reader\Reader_sl.exe"
O4 - HKLM\..\Run: [Adobe ARM] "C:\Program Files\Common Files\Adobe\ARM\1.0\AdobeARM.exe"
O4 - Global Startup: NETGEAR WG311v3 Smart Wizard.lnk = C:\Program Files\NETGEAR\WG311v3\WG311v3.exe
O8 - Extra context menu item: Add To HP Organize... - C:\PROGRA~1\HEWLET~1\HPORGA~1\bin/module.main/favorites\ie_add_to.html
O8 - Extra context menu item: E&xport to Microsoft Excel - res://C:\PROGRA~1\MI1933~1\OFFICE11\EXCEL.EXE/3000
O9 - Extra button: Research - {92780B25-18CC-41C8-B9BE-3C9C571A8263} - C:\PROGRA~1\MI1933~1\OFFICE11\REFIEBAR.DLL
O9 - Extra button: Connection Help - {E2D4D26B-0180-43a4-B05F-462D6D54C789} - C:\WINDOWS\PCHEALTH\HELPCTR\Vendors\CN=Hewlett-Packard,L=Cupertino,S=Ca,C=US\IEButton\support.htm
O9 - Extra 'Tools' menuitem: Connection Help - {E2D4D26B-0180-43a4-B05F-462D6D54C789} - C:\WINDOWS\PCHEALTH\HELPCTR\Vendors\CN=Hewlett-Packard,L=Cupertino,S=Ca,C=US\IEButton\support.htm
O9 - Extra button: (no name) - {e2e2dd38-d088-4134-82b7-f2ba38496583} - C:\WINDOWS\Network Diagnostic\xpnetdiag.exe
O9 - Extra 'Tools' menuitem: @xpsp3res.dll,-20001 - {e2e2dd38-d088-4134-82b7-f2ba38496583} - C:\WINDOWS\Network Diagnostic\xpnetdiag.exe
O9 - Extra button: Messenger - {FB5F1910-F110-11d2-BB9E-00C04F795683} - C:\Program Files\Messenger\msmsgs.exe
O9 - Extra 'Tools' menuitem: Windows Messenger - {FB5F1910-F110-11d2-BB9E-00C04F795683} - C:\Program Files\Messenger\msmsgs.exe
O9 - Extra button: Connection Help - {E2D4D26B-0180-43a4-B05F-462D6D54C789} - C:\WINDOWS\PCHEALTH\HELPCTR\Vendors\CN=Hewlett-Packard,L=Cupertino,S=Ca,C=US\IEButton\support.htm (HKCU)
O9 - Extra 'Tools' menuitem: Connection Help - {E2D4D26B-0180-43a4-B05F-462D6D54C789} - C:\WINDOWS\PCHEALTH\HELPCTR\Vendors\CN=Hewlett-Packard,L=Cupertino,S=Ca,C=US\IEButton\support.htm (HKCU)
O18 - Protocol: linkscanner - {F274614C-63F8-47D5-A4D1-FBDDE494F8D1} - C:\Program Files\AVG9\avgpp.dll
O20 - Winlogon Notify: avgrsstarter - avgrsstx.dll (file missing)
O22 - SharedTaskScheduler: Browseui preloader - {438755C2-A8BA-11D1-B96B-00A0C90312E1} - C:\WINDOWS\system32\browseui.dll
O22 - SharedTaskScheduler: Component Categories cache daemon - {8C7461EF-2B13-11d2-BE35-3078302C2030} - C:\WINDOWS\system32\browseui.dll
O23 - Service: Apple Mobile Device - Apple Inc. - C:\Program Files\Common Files\Apple\Mobile Device Support\bin\AppleMobileDeviceService.exe
O23 - Service: AVG Free WatchDog (avg9wd) - AVG Technologies CZ, s.r.o. - C:\Program Files\AVG9\avgwdsvc.exe
O23 - Service: InstallDriver Table Manager (IDriverT) - Macrovision Corporation - C:\Program Files\Common Files\InstallShield\Driver\11\Intel 32\IDriverT.exe
O23 - Service: iPod Service - Apple Inc. - C:\Program Files\iPod\bin\iPodService.exe
O23 - Service: Pml Driver HPZ12 - HP - C:\WINDOWS\system32\HPZipm12.exe
O23 - Service: Windows User Mode Driver Framework (UMWdf) - Unknown owner - C:\WINDOWS\system32\wdfmgr.exe (file missing)
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End of file - 6147 bytes