No Desktop or Internet Connection

Hello,

I installed and ran some Norton software and now when I start my PC, no icons appear on the desktop. As mentioned in other posts, the registry HKEY entries for explorer.exe and iexplorer.exe are not present. I used a version of explorer.exe from a working PC and can get the desktop to show, but the internet connection is not established. I am not sure where/how to save this version of explorer.exe if that is what I should even do. Any help is greatly appreciated. Below is the my logfile from HijackThis.

Logfile of Trend Micro HijackThis v2.0.2
Scan saved at 12:06:01 PM, on 11/29/2008
Platform: Windows XP SP2 (WinNT 5.01.2600)
MSIE: Internet Explorer v6.00 SP2 (6.00.2900.2180)
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:\Program Files\Trend Micro\HijackThis\HijackThis.exe

R1 - HKCU\Software\Microsoft\Internet Explorer\Main,Default_Page_URL = https://www.dell.com/en-us
R1 - HKLM\Software\Microsoft\Internet Explorer\Main,Default_Page_URL = https://fr.yahoo.com/?p=us
R1 - HKLM\Software\Microsoft\Internet Explorer\Main,Search Bar = http://us.rd.yahoo.com/customize/ie/defaults/sb/msgr8/*http://www.yahoo.com/ext/search/search.html
R3 - URLSearchHook: (no name) - ~EF99BD32-C1FB-11D2-892F-0090271D4F88} - (no file)
R3 - URLSearchHook: (no name) - ~CFBFAE00-17A6-11D0-99CB-00C04FD64497} - (no file)
R3 - URLSearchHook: MyIdentityDefender - {A26503FE-B3B8-4910-A9DC-9CBD25C6B8D6} - C:\Documents and Settings\Gene Nell\Local Settings\Application Data\CyberDefender\cdmyidd.dll
O2 - BHO: &Yahoo! Toolbar Helper - {02478D38-C3F9-4EFB-9B51-7695ECA05670} - C:\PROGRA~1\Yahoo!\Companion\Installs\cpn2\yt.dll
O2 - BHO: MyIdentityDefender - {a26503fe-b3b8-4910-a9dc-9cbd25c6b8d6} - C:\Documents and Settings\Gene Nell\Local Settings\Application Data\CyberDefender\cdmyidd.dll
O3 - Toolbar: My &Search Bar - {0494D0D9-F8E0-41ad-92A3-14154ECE70AC} - C:\Program Files\MyWay\myBar\1.bin\MYBAR.DLL
O3 - Toolbar: Yahoo! Toolbar - {EF99BD32-C1FB-11D2-892F-0090271D4F88} - C:\PROGRA~1\Yahoo!\Companion\Installs\cpn2\yt.dll
O3 - Toolbar: MyIdentityDefender - {A26503FE-B3B8-4910-A9DC-9CBD25C6B8D6} - C:\Documents and Settings\Gene Nell\Local Settings\Application Data\CyberDefender\cdmyidd.dll
O4 - HKLM\..\Run: [NAV] "C:\Program Files\NortonInstaller\{0C55C096-0F1D-4F28-AAA2-85EF591126E7}\NAV\2454B0AB\16.0.0.125\InstStub.exe" /RELAUNCH /RUNONCE /MEDIA "D:\NSW\NAV\SETUP.EXE" /NOPROMPT /SCANNER /PATH "C:\Program Files\Norton AntiVirus"
O4 - HKLM\..\Run: [MSConfig] C:\WINDOWS\PCHealth\HelpCtr\Binaries\MSConfig.exe /auto
O6 - HKCU\Software\Policies\Microsoft\Internet Explorer\Control Panel present
O8 - Extra context menu item: &Search - http://edits.mywebsearch.com/toolbaredits/menusearch.jhtml?p=ZJxdm128LWUS
O8 - Extra context menu item: &Yahoo! Search - file:///C:\Program Files\Yahoo!\Common/ycsrch.htm
O8 - Extra context menu item: E&xport to Microsoft Excel - res://C:\PROGRA~1\MICROS~4\Office10\EXCEL.EXE/3000
O8 - Extra context menu item: Yahoo! &Dictionary - file:///C:\Program Files\Yahoo!\Common/ycdict.htm
O8 - Extra context menu item: Yahoo! &Maps - file:///C:\Program Files\Yahoo!\Common/ycmap.htm
O8 - Extra context menu item: Yahoo! &SMS - file:///C:\Program Files\Yahoo!\Common/ycsms.htm
O9 - Extra button: (no name) - {08B0E5C0-4FCB-11CF-AAA5-00401C608501} - C:\Program Files\Java\jre1.6.0_07\bin\ssv.dll
O9 - Extra 'Tools' menuitem: Sun Java Console - {08B0E5C0-4FCB-11CF-AAA5-00401C608501} - C:\Program Files\Java\jre1.6.0_07\bin\ssv.dll
O9 - Extra button: Yahoo! Services - {5BAB4B5B-68BC-4B02-94D6-2FC0DE4A7897} - C:\Program Files\Yahoo!\Common\yiesrvc.dll
O9 - Extra button: Express Cleanup - {5E638779-1818-4754-A595-EF1C63B87A56} - C:\Program Files\Norton SystemWorks Premier Edition\Norton Cleanup\WCQuick.lnk
O9 - Extra 'Tools' menuitem: Express Cleanup - {5E638779-1818-4754-A595-EF1C63B87A56} - C:\Program Files\Norton SystemWorks Premier Edition\Norton Cleanup\WCQuick.lnk
O9 - Extra button: Real.com - {CD67F990-D8E9-11d2-98FE-00C0F0318AFE} - C:\WINDOWS\System32\Shdocvw.dll
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
O16 - DPF: {01A88BB1-1174-41EC-ACCB-963509EAE56B} (SysProWmi Class) - http://support.dell.com/systemprofiler/SysPro.CAB
O16 - DPF: {17492023-C23A-453E-A040-C7C580BBF700} (Windows Genuine Advantage Validation Tool) - http://download.microsoft.com/download/E/5/6/E5611B10-0D6D-4117-8430-A67417AA88CD/LegitCheckControl.cab
O16 - DPF: {1D4DB7D2-6EC9-47A3-BD87-1E41684E07BB} - http://ak.exe.imgfarm.com/images/nocache/funwebproducts/ei/ZwinkyInitialSetup1.0.0.15-3.cab
O16 - DPF: {30528230-99f7-4bb4-88d8-fa1d4f56a2ab} (Installation Support) - C:\Program Files\Yahoo!\Common\Yinsthelper.dll
O16 - DPF: {406B5949-7190-4245-91A9-30A17DE16AD0} (Snapfish Activia) - https://www.costcophotocenter.com/SignIn?ReturnUrl=%2fCostcoActivia.cab
O16 - DPF: {48DD0448-9209-4F81-9F6D-D83562940134} (MySpace Uploader Control) - http://lads.myspace.com/upload/MySpaceUploader1006.cab
O16 - DPF: {63FA0A10-5AA8-449F-9C5B-C8853F697405} - http://mediaplayer.walmart.com/installer/install.cab
O16 - DPF: {6414512B-B978-451D-A0D8-FCFDF33E833C} (WUWebControl Class) - http://v5.windowsupdate.microsoft.com/v5consumer/V5Controls/en/x86/client/wuweb_site.cab?1096911743397
O16 - DPF: {F04A8AE2-A59D-11D2-8792-00C04F8EF29D} (Hotmail Attachments Control) - http://by112fd.bay112.hotmail.msn.com/activex/HMAtchmt.ocx
O20 - AppInit_DLLs: karna.dat
O21 - SSODL: DXMPgsplhZqH - {006530BF-AACF-9A15-244D-7AAE49C89B31} - C:\WINDOWS\system32\qzg.dll (file missing)
O23 - Service: DCOM Server Process Launcher (DcomLaunch) - Unknown owner - C:\WINDOWS\system32\svchost.exe (file missing)
O23 - Service: Remote Procedure Call (RPC) (RpcSs) - Unknown owner - C:\WINDOWS\system32\svchost.exe (file missing)
O23 - Service: System Restore Service (srservice) - Unknown owner - C:\WINDOWS\System32\svchost.exe (file missing)