Adware / Spyware....help please

I keep getting pop up adds ....solid grey box's keep popping up... advertising drugs or sex.... title of the window is always " Messenger Service" ...
Here is my Hijackthis log

Logfile of HijackThis v1.97.5
Scan saved at 11:29:11 AM, on 4/14/2004
Platform: Windows XP SP1 (WinNT 5.01.2600)
MSIE: Internet Explorer v6.00 SP1 (6.00.2800.1106)

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\Common Files\Symantec Shared\ccSetMgr.exe
C:\Program Files\Common Files\Symantec Shared\ccEvtMgr.exe
C:\WINDOWS\system32\spoolsv.exe
C:\WINDOWS\Explorer.EXE
C:\WINDOWS\System32\gearsec.exe
C:\Program Files\Common Files\Microsoft Shared\VS7DEBUG\MDM.EXE
C:\Program Files\Norton SystemWorks\Norton Antivirus\navapsvc.exe
C:\Program Files\Analog Devices\SoundMAX\SMax4PNP.exe
C:\Program Files\Analog Devices\SoundMAX\Smax4.exe
C:\PROGRA~1\NORTON~1\NORTON~2\NPROTECT.EXE
C:\WINDOWS\System32\nvsvc32.exe
C:\Program Files\Analog Devices\SoundMAX\SMAgent.exe
C:\PROGRA~1\NORTON~1\NORTON~2\SPEEDD~1\NOPDB.EXE
C:\Program Files\Common Files\Symantec Shared\CCPD-LC\symlcsvc.exe
C:\Program Files\Norton SystemWorks\Norton Antivirus\SAVScan.exe
C:\Program Files\Common Files\Symantec Shared\Nmain.exe
C:\WINDOWS\System32\ctfmon.exe
C:\Program Files\Norton SystemWorks\Password Manager\AcctMgr.exe
C:\Program Files\MSN Messenger\msnmsgr.exe
C:\Program Files\Yahoo!\Messenger\YPager.exe
C:\Program Files\Internet Explorer\iexplore.exe
C:\Documents and Settings\Ricky\Local Settings\Temp\Temporary Directory 1 for hijackthis.zip\HijackThis.exe

R1 - HKCU\Software\Microsoft\Internet Explorer\Main,Search Bar = http://red.clientapps.yahoo.com/customize/ycomp/defaults/sb/*http://www.yahoo.com/search/ie.html
R1 - HKCU\Software\Microsoft\Internet Explorer\Main,Search Page = http://red.clientapps.yahoo.com/customize/ycomp/defaults/sp/*http://www.yahoo.com
R0 - HKCU\Software\Microsoft\Internet Explorer\Main,Start Page = http://gunbound.net/
R0 - HKLM\Software\Microsoft\Internet Explorer\Main,Start Page = http://www.microsoft.com/isapi/redir.dll?prd={SUB_PRD}&clcid={SUB_CLSID}&pver={SUB_PVER}&ar=home
R1 - HKLM\Software\Microsoft\Internet Explorer\Main,Search Bar = http://red.clientapps.yahoo.com/cus.../*http://www.yahoo.com/ext/search/search.html
R1 - HKLM\Software\Microsoft\Internet Explorer\Main,Search Page = http://www.microsoft.com/isapi/redir.dll?prd=ie&ar=iesearch
R1 - HKLM\Software\Microsoft\Internet Explorer\Main,Default_Page_URL = http://www.microsoft.com/isapi/redir.dll?prd=ie&pver=6&ar=msnhome
R1 - HKLM\Software\Microsoft\Internet Explorer\Main,Default_Search_URL = http://www.microsoft.com/isapi/redir.dll?prd=ie&ar=iesearch
R1 - HKCU\Software\Microsoft\Internet Explorer\SearchURL,(Default) = http://red.clientapps.yahoo.com/customize/ycomp/defaults/su/*http://www.yahoo.com
O2 - BHO: (no name) - {000020DD-C72E-4113-AF77-DD56626C6C42} - (no file)
O2 - BHO: (no name) - {02478D38-C3F9-4efb-9B51-7695ECA05670} - C:\Program Files\Yahoo!\Companion\Installs\cpn0\ycomp5_3_16_0.dll
O2 - BHO: (no name) - {06849E9F-C8D7-4D59-B87D-784B7D6BE0B3} - C:\Program Files\Adobe\Acrobat 6.0\Reader\ActiveX\AcroIEHelper.dll
O2 - BHO: NAV Helper - {BDF3E430-B101-42AD-A544-FADC6B084872} - C:\Program Files\Norton SystemWorks\Norton Antivirus\NavShExt.dll
O3 - Toolbar: Yahoo! Companion - {EF99BD32-C1FB-11D2-892F-0090271D4F88} - C:\Program Files\Yahoo!\Companion\Installs\cpn0\ycomp5_3_16_0.dll
O3 - Toolbar: &Radio - {8E718888-423F-11D2-876E-00A0C9082467} - C:\WINDOWS\System32\msdxm.ocx
O3 - Toolbar: Norton AntiVirus - {42CDD1BF-3FFB-4238-8AD1-7859DF00B1D6} - C:\Program Files\Norton SystemWorks\Norton Antivirus\NavShExt.dll
O4 - HKLM\..\Run: [SoundMAXPnP] C:\Program Files\Analog Devices\SoundMAX\SMax4PNP.exe
O4 - HKLM\..\Run: [SoundMAX] "C:\Program Files\Analog Devices\SoundMAX\Smax4.exe" /tray
O4 - HKLM\..\Run: [NvCplDaemon] RUNDLL32.EXE C:\WINDOWS\System32\NvCpl.dll,NvStartup
O4 - HKLM\..\Run: [AcctMgr] C:\Program Files\Norton SystemWorks\Password Manager\AcctMgr.exe /startup
O4 - HKCU\..\Run: [ctfmon.exe] C:\WINDOWS\System32\ctfmon.exe
O4 - HKCU\..\Run: [msnmsgr] "C:\Program Files\MSN Messenger\msnmsgr.exe" /background
O8 - Extra context menu item: LimeShop Preferences - file://C:\Program Files\LimeShop\System\Temp\limeshop_script0.htm
O9 - Extra button: Messenger (HKLM)
O9 - Extra 'Tools' menuitem: Yahoo! Messenger (HKLM)
O9 - Extra button: Research (HKLM)
O9 - Extra button: Related (HKLM)
O9 - Extra 'Tools' menuitem: Show &Related Links (HKLM)
O9 - Extra button: Messenger (HKLM)
O9 - Extra 'Tools' menuitem: Messenger (HKLM)
O16 - DPF: {02BF25D5-8C17-4B23-BC80-D3488ABDDC6B} (QuickTime Object) - http://www.apple.com/qtactivex/qtplugin.cab
O16 - DPF: {166B1BCA-3F9C-11CF-8075-444553540000} (Shockwave ActiveX Control) - http://fpdownload.macromedia.com/pub/shockwave/cabs/director/swdir.cab
O16 - DPF: {30528230-99F7-4BB4-88D8-FA1D4F56A2AB} (YInstStarter Class) - http://download.yahoo.com/dl/installs/yinst0401.cab
O16 - DPF: {39B0684F-D7BF-4743-B050-FDC3F48F7E3B} (FilePlanet Download Control Class) - http://www.fileplanet.com/fpdlmgr/cabs/FPDC_1_0_0_41.cab
O16 - DPF: {3E68E405-C6DE-49FF-83AE-41EE9F4C36CE} (Office Update Installation Engine) - http://office.microsoft.com/officeupdate/content/opuc.cab
O16 - DPF: {88D969C0-F192-11D4-A65F-0040963251E5} (XML DOM Document 4.0) - file://C:\TempEI4\EI40_\msxml4.cab
O16 - DPF: {9F1C11AA-197B-4942-BA54-47A8489BB47F} (Update Class) - http://v4.windowsupdate.microsoft.com/CAB/x86/unicode/iuctl.CAB?38028.3138657407
O16 - DPF: {A17E30C4-A9BA-11D4-8673-60DB54C10000} (YahooYMailTo Class) - http://us.dl1.yimg.com/download.yahoo.com/dl/installs/yse/ymmapi_416.dll
O16 - DPF: {D10B5C22-DC60-430D-B548-489CB49A2367} (FreeScan Class) - http://alternatedownload.zeroads.com/zerospyware/landingpage/files/zsfreescan.cab
O16 - DPF: {D27CDB6E-AE6D-11CF-96B8-444553540000} (Shockwave Flash Object) - http://download.macromedia.com/pub/shockwave/cabs/flash/swflash.cab
O16 - DPF: {F54C1137-5E34-4B95-95A5-BA56D4D8D743} (Secure Delivery) - http://www.gamespot.com/KDX22/download/kdx.cab

Even Nortan and online programs are detecting spy/adware...please inform on how to fix this....