It shouldn't take even close to 1.6GHZ to run IE or do anything online for that matter. We're not talking about playing games here. My 100 mhz computer from 10 years ago could do this much without hogging CPU usage. I couldn't get a screenshot again because by the time I could get Task Manager to come up, the CPU usage went down (another reason why this can't have anything to do with my CPU, that it gets better over time), but I can tell you easily enough what you would see: System Idle - 97% and ever other process at 0% with maybe one at 5%, total CPU Usage - 100%.
Edit:
1) Post your programs that appear when you sign on
2) Run HiJackThis
3) See if there is any difference when you start in Safemode
Odds are that you don't need a new computer. You're going to have to list your other hardware specs, but you might have: a config problem, too many programs on load (virus checker, messengers, office), or a virus
Here is my HighJackThis log:
Logfile of Trend Micro HijackThis v2.0.2
Scan saved at 9:38:32 PM, on 11/5/2008
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:\WINDOWS\system32\Ati2evxx.exe
C:\WINDOWS\system32\svchost.exe
C:\WINDOWS\System32\svchost.exe
C:\WINDOWS\system32\Ati2evxx.exe
C:\WINDOWS\Explorer.EXE
C:\WINDOWS\system32\spoolsv.exe
C:\WINDOWS\system32\andqgibw.exe
C:\WINDOWS\system32\inetsrv\inetinfo.exe
c:\PROGRA~1\mcafee.com\vso\mcvsrte.exe
C:\PROGRA~1\McAfee.com\PERSON~1\MPFSERVICE.exe
C:\Program Files\Linksys\Wireless-G Notebook Adapter\NICServ.exe
C:\WINDOWS\system32\svchost.exe
C:\Program Files\Java\jre1.6.0_07\bin\jusched.exe
C:\PROGRA~1\mcafee.com\agent\McAgent.exe
C:\WINDOWS\system32\ctfmon.exe
C:\Program Files\Google\GoogleToolbarNotifier\GoogleToolbarNotifier.exe
C:\Program Files\Olympus\DeviceDetector\DevDtct2.exe
C:\Program Files\Linksys\Wireless-G Notebook Adapter\Gcc.exe
C:\Program Files\Linksys\Wireless-G Notebook Adapter\OdHost.exe
c:\PROGRA~1\mcafee.com\vso\mcshield.exe
C:\PROGRA~1\McAfee.com\PERSON~1\MpfAgent.exe
C:\WINDOWS\System32\svchost.exe
C:\Program Files\Internet Explorer\iexplore.exe
C:\Program Files\Trend Micro\HijackThis\HijackThis.exe
R1 - HKCU\Software\Microsoft\Internet Explorer\Main,Default_Page_URL =
http://www.dell4me.com/myway
R1 - HKLM\Software\Microsoft\Internet Explorer\Main,Default_Page_URL =
http://www.orwell.net
R0 - HKLM\Software\Microsoft\Internet Explorer\Main,Start Page =
http://www.dell4me.com/myway
R1 - HKCU\Software\Microsoft\Internet Explorer\Main,Window Title = Microsoft Internet Explorer provided by Orwell Communications
R0 - HKCU\Software\Microsoft\Internet Explorer\Toolbar,LinksFolderName =
R3 - URLSearchHook: (no name) - {4D25F926-B9FE-4682-BF72-8AB8210D6D75} - (no file)
R3 - URLSearchHook: Yahoo! Toolbar - {EF99BD32-C1FB-11D2-892F-0090271D4F88} - C:\PROGRA~1\Yahoo!\Companion\Installs\cpn\yt.dll
O2 - BHO: &Yahoo! Toolbar Helper - {02478D38-C3F9-4efb-9B51-7695ECA05670} - C:\PROGRA~1\Yahoo!\Companion\Installs\cpn\yt.dll
O2 - BHO: AcroIEHlprObj Class - {06849E9F-C8D7-4D59-B87D-784B7D6BE0B3} - C:\Program Files\Adobe\Acrobat 6.0\Reader\ActiveX\AcroIEHelper.dll
O2 - BHO: (no name) - {21B4ACC4-8874-4AEC-AEAC-F567A249B4D4} - (no file)
O2 - BHO: Rmn plugin - {21D7135F-AEE9-45e7-A0C1-791A4654BFF1} - svc32.dll (file missing)
O2 - BHO: (no name) - {53707962-6F74-2D53-2644-206D7942484F} - C:\PROGRA~1\SPYBOT~1\SDHelper.dll
O2 - BHO: Yahoo! IE Services Button - {5BAB4B5B-68BC-4B02-94D6-2FC0DE4A7897} - C:\Program Files\Yahoo!\Common\yiesrvc.dll
O2 - BHO: DriveLetterAccess - {5CA3D70E-1895-11CF-8E15-001234567890} - C:\WINDOWS\system32\dla\tfswshx.dll
O2 - BHO: MSEvents Object - {6DD0BC06-4719-4BA3-BEBC-FBAE6A448152} - C:\WINDOWS\system32\yabaa.dll (file missing)
O2 - BHO: SSVHelper Class - {761497BB-D6F0-462C-B6EB-D4DAF1D92D43} - C:\Program Files\Java\jre1.6.0_07\bin\ssv.dll
O2 - BHO: BHObj Class - {8F4E5661-F99E-4B3E-8D85-0EA71C0748E4} - C:\WINDOWS\wsem303.dll
O2 - BHO: Multiply Toolbar - {A057A204-BACC-4D26-C4DC-6BA49CE16884} - C:\PROGRA~1\multiply\multiply.dll
O2 - BHO: Google Toolbar Helper - {AA58ED58-01DD-4d91-8333-CF10577473F7} - c:\program files\google\googletoolbar3.dll
O2 - BHO: Google Toolbar Notifier BHO - {AF69DE43-7D58-4638-B6FA-CE66B5AD205D} - C:\Program Files\Google\GoogleToolbarNotifier\3.1.807.1746\swg.dll
O2 - BHO: ADP UrlCatcher Class - {F4E04583-354E-4076-BE7D-ED6A80FD66DA} - C:\WINDOWS\system32\msbe.dll (file missing)
O2 - BHO: Internet Explorer Web Content Catcher - {FFF4E223-7019-4ce7-BE03-D7D3C8CCE884} - C:\Program Files\DNS\Catcher.dll
O3 - Toolbar: McAfee VirusScan - {BA52B914-B692-46c4-B683-905236F6F655} - c:\progra~1\mcafee.com\vso\mcvsshl.dll
O3 - Toolbar: &Google - {2318C2B1-4965-11d4-9B18-009027A5CD4F} - c:\program files\google\googletoolbar3.dll
O3 - Toolbar: Multiply Toolbar - {A057A204-BACC-4D26-C4DC-6BA49CE16884} - C:\PROGRA~1\multiply\multiply.dll
O3 - Toolbar: Yahoo! Toolbar - {EF99BD32-C1FB-11D2-892F-0090271D4F88} - C:\PROGRA~1\Yahoo!\Companion\Installs\cpn\yt.dll
O4 - HKLM\..\Run: [SunJavaUpdateSched] "C:\Program Files\Java\jre1.6.0_07\bin\jusched.exe"
O4 - HKLM\..\Run: [MCUpdateExe] C:\PROGRA~1\mcafee.com\agent\mcupdate.exe
O4 - HKLM\..\Run: [MCAgentExe] c:\PROGRA~1\mcafee.com\agent\McAgent.exe
O4 - HKCU\..\Run: [ctfmon.exe] C:\WINDOWS\system32\ctfmon.exe
O4 - HKCU\..\Run: [swg] C:\Program Files\Google\GoogleToolbarNotifier\GoogleToolbarNotifier.exe
O4 - Global Startup: 20-20 Shortcut Bar.lnk = C:\2020V61\Mswin\60\SCBar.Exe
O4 - Global Startup: Device Detector 3.lnk = C:\Program Files\Olympus\DeviceDetector\DevDtct2.exe
O4 - Global Startup: Wireless-G Notebook Adapter.lnk = C:\Program Files\Linksys\Wireless-G Notebook Adapter\Gcc.exe
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: 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
O12 - Plugin for .wav: C:\Program Files\Internet Explorer\PLUGINS\npqtplugin2.dll
O14 - IERESET.INF: START_PAGE_URL=http://www.orwell.net
O16 - DPF: {30528230-99f7-4bb4-88d8-fa1d4f56a2ab} (Installation Support) - C:\Program Files\Yahoo!\Common\Yinsthelper.dll
O16 - DPF: {3DCEC959-378A-4922-AD7E-FD5C925D927F} (Disney Online Games ActiveX Control) -
http://disney.go.com/pirates/online/testActiveX/built/signed/DisneyOnlineGames.cab
O16 - DPF: {B38870E4-7ECB-40DA-8C6A-595F0A5519FF} (MsnMessengerSetupDownloadControl Class) -
http://messenger.msn.com/download/MsnMessengerSetupDownloader.cab
O20 - Winlogon Notify: Fly - C:\WINDOWS\SYSTEM32\smart.dll
O20 - Winlogon Notify: Love - C:\WINDOWS\SYSTEM32\LoveFly.dll
O20 - Winlogon Notify: yabaa - C:\WINDOWS\system32\yabaa.dll (file missing)
O23 - Service: Ati HotKey Poller - Unknown owner - C:\WINDOWS\system32\Ati2evxx.exe
O23 - Service: DomainService - - C:\WINDOWS\system32\andqgibw.exe
O23 - Service: Google Updater Service (gusvc) - Google - C:\Program Files\Google\Common\Google Updater\GoogleUpdaterService.exe
O23 - Service: McAfee.com McShield (McShield) - Unknown owner - c:\PROGRA~1\mcafee.com\vso\mcshield.exe
O23 - Service: McAfee SecurityCenter Update Manager (mcupdmgr.exe) - McAfee, Inc - C:\PROGRA~1\McAfee.com\Agent\mcupdmgr.exe
O23 - Service: McAfee.com VirusScan Online Realtime Engine (MCVSRte) - Networks Associates Technology, Inc - c:\PROGRA~1\mcafee.com\vso\mcvsrte.exe
O23 - Service: McAfee Personal Firewall Service (MpfService) - McAfee Corporation - C:\PROGRA~1\McAfee.com\PERSON~1\MPFSERVICE.exe
O23 - Service: MySQL - Unknown owner - C:\Program.exe (file missing)
O23 - Service: NICSer_WPC54G - Unknown owner - C:\Program Files\Linksys\Wireless-G Notebook Adapter\NICServ.exe
--
End of file - 7488 bytes