Last night my computer looked like it was in a reboot loop and the backgroung had changed to a warn me of needing an antivirus etc.. The background and screensaver tabs in desktop properties have disapeared so I can't change them. Scanned w/ Panda and Spysweeper. Computer runs fine except when the screensaver starts. I thought it was the computer rebooting but turns out its only a screensaver simulating a reboot, pushing f8 brings up the desktop again and computer runs fine. I also cannot run windows update and automatic updates has been disabled as well. I am really stuck and appreciate any help. THANKS!!

Logfile of Trend Micro HijackThis v2.0.2
Scan saved at 6:16:40 PM, on 7/9/2008
Platform: Windows XP SP2 (WinNT 5.01.2600)
MSIE: Internet Explorer v7.00 (7.00.6000.16674)
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\Ati2evxx.exe
C:\WINDOWS\system32\svchost.exe
C:\Program Files\Panda Security\Panda Antivirus 2008\pavsrv51.exe
C:\Program Files\Panda Security\Panda Antivirus 2008\AVENGINE.EXE
C:\WINDOWS\System32\svchost.exe
C:\WINDOWS\system32\Ati2evxx.exe
C:\WINDOWS\system32\svchost.exe
C:\WINDOWS\Explorer.EXE
C:\WINDOWS\system32\spoolsv.exe
C:\Program Files\Panda Security\Panda Antivirus 2008\APVXDWIN.EXE
C:\Program Files\Browser MOUSE\mouse32a.exe
C:\Program Files\Webroot\Spy Sweeper\SpySweeperUI.exe
C:\Program Files\Palm\Hotsync.exe
C:\Program Files\Rainlendar\Rainlendar.exe
C:\Program Files\Yahoo!\Yahoo! Desktop Search\YahooDesktopSearch.exe
C:\Program Files\Yahoo!\Widgets\YahooWidgets.exe
C:\Program Files\Common Files\Apple\Mobile Device Support\bin\AppleMobileDeviceService.exe
C:\Program Files\Bonjour\mDNSResponder.exe
C:\Program Files\Common Files\Microsoft Shared\VS7DEBUG\MDM.EXE
C:\Program Files\Panda Security\Panda Antivirus 2008\PsCtrls.exe
C:\Program Files\Yahoo!\Widgets\YahooWidgets.exe
C:\program files\yahoo!\yahoo! desktop search\YDSsystray.exe
C:\Program Files\Yahoo!\Widgets\YahooWidgets.exe
C:\Program Files\Yahoo!\Widgets\YahooWidgets.exe
C:\Program Files\Common Files\Panda Software\PavShld\pavprsrv.exe
C:\Program Files\Panda Security\Panda Antivirus 2008\PsImSvc.exe
C:\WINDOWS\system32\svchost.exe
C:\Program Files\Webroot\Spy Sweeper\SpySweeper.exe
C:\WINDOWS\system32\wscntfy.exe
C:\Program Files\Panda Security\Panda Antivirus 2008\WebProxy.exe
C:\WINDOWS\System32\svchost.exe
c:\program files\yahoo!\yahoo! desktop search\textExtractor.exe
C:\Program Files\Mozilla Thunderbird\thunderbird.exe
C:\Program Files\Opera\opera.exe
C:\Program Files\Webroot\Spy Sweeper\SSU.EXE
C:\Program Files\Trend Micro\HijackThis\HijackThis.exe

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 Page = http://go.microsoft.com/fwlink/?LinkId=54896
R0 - HKLM\Software\Microsoft\Internet Explorer\Main,Start Page = http://go.microsoft.com/fwlink/?LinkId=69157
R1 - HKCU\Software\Microsoft\Windows\CurrentVersion\Internet Settings,ProxyOverride = *.local
O4 - HKLM\..\Run: [APVXDWIN] "C:\Program Files\Panda Security\Panda Antivirus 2008\APVXDWIN.EXE" /s
O4 - HKLM\..\Run: [FLMOFFICE4DMOUSE] "C:\Program Files\Browser MOUSE\mouse32a.exe"
O4 - HKLM\..\Run: [HotSync] "C:\Program Files\PalmSource\Desktop\HotSync.exe" -AllUsers
O4 - HKLM\..\Run: [SpySweeper] "C:\Program Files\Webroot\Spy Sweeper\SpySweeperUI.exe" /startintray
O4 - Startup: Rainlendar.lnk = C:\Program Files\Rainlendar\Rainlendar.exe
O4 - Startup: Yahoo! Desktop Search.lnk = C:\Program Files\Yahoo!\Yahoo! Desktop Search\YahooDesktopSearch.exe
O4 - Startup: Yahoo! Widgets.lnk = C:\Program Files\Yahoo!\Widgets\YahooWidgets.exe
O4 - Global Startup: HotSync Manager.lnk = C:\Program Files\Palm\Hotsync.exe
O4 - Global Startup: HOTSYNCSHORTCUTNAME.lnk = C:\Program Files\palmOne\Hotsync.exe
O8 - Extra context menu item: E&xport to Microsoft Excel - res://C:\PROGRA~1\MICROS~2\OFFICE11\EXCEL.EXE/3000
O9 - Extra button: (no name) - {08B0E5C0-4FCB-11CF-AAA5-00401C608501} - C:\Program Files\Java\jre1.6.0_03\bin\ssv.dll
O9 - Extra 'Tools' menuitem: Sun Java Console - {08B0E5C0-4FCB-11CF-AAA5-00401C608501} - C:\Program Files\Java\jre1.6.0_03\bin\ssv.dll
O9 - Extra button: Bonjour - {7F9DB11C-E358-4ca6-A83D-ACC663939424} - C:\Program Files\Bonjour\ExplorerPlugin.dll
O9 - Extra button: Research - {92780B25-18CC-41C8-B9BE-3C9C571A8263} - C:\PROGRA~1\MICROS~2\OFFICE11\REFIEBAR.DLL
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
O16 - DPF: {2D8ED06D-3C30-438B-96AE-4D110FDC1FB8} (ActiveScan 2.0 Installer Class) - http://acs.pandasoftware.com/activescan/cabs/as2stubie.cab
O16 - DPF: {30528230-99f7-4bb4-88d8-fa1d4f56a2ab} (Installation Support) - C:\Program Files\Yahoo!\Common\Yinsthelper.dll
O16 - DPF: {512FC5A1-7DE1-43F1-BC0C-371622FCB409} (TotalScan Installer Class) - http://www.nanoscan.com/as/cabs/ascstubie.cab
O23 - Service: Apple Mobile Device - Apple, Inc. - C:\Program Files\Common Files\Apple\Mobile Device Support\bin\AppleMobileDeviceService.exe
O23 - Service: Ati HotKey Poller - ATI Technologies Inc. - C:\WINDOWS\system32\Ati2evxx.exe
O23 - Service: ATI Smart - Unknown owner - C:\WINDOWS\system32\ati2sgag.exe
O23 - Service: Bonjour Service - Apple Inc. - C:\Program Files\Bonjour\mDNSResponder.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: Panda Software Controller - Panda Software International - C:\Program Files\Panda Security\Panda Antivirus 2008\PsCtrls.exe
O23 - Service: Panda Process Protection Service (PavPrSrv) - Panda Software - C:\Program Files\Common Files\Panda Software\PavShld\pavprsrv.exe
O23 - Service: Panda anti-virus service (PAVSRV) - Panda Software International - C:\Program Files\Panda Security\Panda Antivirus 2008\pavsrv51.exe
O23 - Service: Panda IManager Service (PSIMSVC) - Panda Software International - C:\Program Files\Panda Security\Panda Antivirus 2008\PsImSvc.exe
O23 - Service: Webroot Spy Sweeper Engine (WebrootSpySweeperService) - Webroot Software, Inc. - C:\Program Files\Webroot\Spy Sweeper\SpySweeper.exe

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End of file - 6416 bytes

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Followed MRP procedure after the link was fixed. Either CCleaner or Spybot fixed the issue.