100% CPU Usage Taskmgr.exe & Firefox.exe

Hello,
I have a bug on my laptop. I will turn on PC, it might go 15 minutes then all of a sudden it starts slowing down locking up. I goto Task manager and see that Taskmgr.exe and firefox.exe (sometimes also lsass.exe is clocking too)is continuously running from 0 to 100 and so on. CPU usage stays clocked at 100%. End process and then it comes back in like 5 minutes. If i have firefox open it will reload the page over and over. If i click on my desktop, all my icons will flicker.

I can hit escape key and it goes away for like 60 seconds.

If have to do a hard shutdown, then the comp starts beeping when it comes back on for about 10 seconds before it boots up.

I have ran every virus scanner/spyware I could find. I took MCafee off and put on Trend. Ran Adaware, Spybot S & D, CWShredder etc, and found nothing but cookies. Even defrag/clean with Fix-it 6!

I havent installed any hardware or any software recently.

I have a Dell Inspiron 5100 xp service pack2 home edition
Pentium 4 CPU 2.66 GHZ 768 MB RAM

the following is my hijackthis log, any help would be appreciated greatly!:

Logfile of HijackThis v1.99.1
Scan saved at 10:41:53 PM, on 10/2/2006
Platform: Windows XP SP2 (WinNT 5.01.2600)
MSIE: Internet Explorer v6.00 SP2 (6.00.2900.2180)

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\Explorer.EXE
C:\WINDOWS\system32\spoolsv.exe
C:\PROGRA~1\VCOM\Fix-It\mxtask.exe
C:\PROGRA~1\TRENDM~1\INTERN~1\PcCtlCom.exe
C:\PROGRA~1\TRENDM~1\INTERN~1\TmPfw.exe
C:\PROGRA~1\TRENDM~1\INTERN~1\tmproxy.exe
C:\Program Files\UPHClean\uphclean.exe
C:\WINDOWS\System32\wltrysvc.exe
C:\PROGRA~1\VCOM\Fix-It\mxtask.exe
C:\PROGRA~1\TRENDM~1\INTERN~1\PcScnSrv.exe
C:\WINDOWS\system32\wscntfy.exe
C:\Program Files\Trend Micro\Internet Security 2007\TMAS_OE\TMAS_OEMon.exe
C:\Program Files\Messenger\MSMSGS.EXE
C:\WINDOWS\System32\bcmwltry.exe
C:\PROGRA~1\TRENDM~1\INTERN~1\PccGuide.exe
C:\PROGRA~1\Yahoo!\MESSEN~1\YAHOOM~1.EXE
C:\Program Files\Mozilla Firefox\firefox.exe
C:\Documents and Settings\Rob\Desktop\HijackThis_v1.99.1.exe

R3 - URLSearchHook: Yahoo! Toolbar - {EF99BD32-C1FB-11D2-892F-0090271D4F88} - C:\Program Files\Yahoo!\Companion\Installs\cpn\yt.dll
O1 - Hosts file is located at: C:\WINDOWS\System32\drivers\etc\hosts
O2 - BHO: Yahoo! Toolbar Helper - {02478D38-C3F9-4EFB-9B51-7695ECA05670} - C:\Program Files\Yahoo!\Companion\Installs\cpn\yt.dll
O2 - BHO: AcroIEHlprObj Class - {06849E9F-C8D7-4D59-B87D-784B7D6BE0B3} - C:\Program Files\Adobe\Acrobat 5.0\Reader\ActiveX\AcroIEHelper.ocx
O2 - BHO: Yahoo! IE Services Button - {5BAB4B5B-68BC-4B02-94D6-2FC0DE4A7897} - C:\Program Files\Yahoo!\Common\yiesrvc.dll
O2 - BHO: SSVHelper Class - {761497BB-D6F0-462C-B6EB-D4DAF1D92D43} - C:\Program Files\Java\jre1.5.0_06\bin\ssv.dll
O3 - Toolbar: Yahoo! Toolbar - {EF99BD32-C1FB-11D2-892F-0090271D4F88} - C:\Program Files\Yahoo!\Companion\Installs\cpn\yt.dll
O4 - HKLM\..\Run: [Fix-It AV] C:\PROGRA~1\VCOM\Fix-It\MemCheck.exe
O4 - HKCU\..\Run: [OE] "C:\Program Files\Trend Micro\Internet Security 2007\TMAS_OE\TMAS_OEMon.exe"
O4 - HKCU\..\Run: [MSMSGS] "C:\Program Files\Messenger\MSMSGS.EXE" /background
O4 - HKCU\..\Run: [Yahoo! Pager] "C:\PROGRA~1\Yahoo!\MESSEN~1\YAHOOM~1.EXE" -quiet
O4 - Global Startup: Adobe Gamma Loader.lnk = C:\Program Files\Common Files\Adobe\Calibration\Adobe Gamma Loader.exe
O4 - Global Startup: Microsoft Office.lnk = C:\Program Files\Microsoft Office\Office\OSA9.EXE
O4 - Global Startup: Palo Alto Software Update Manager 8.0.lnk = C:\Program Files\Common Files\Palo Alto Software\8.0\PAS8_Update.exe
O8 - Extra context menu item: &Yahoo! Search - file:///C:\Program Files\Yahoo!\Common/ycsrch.htm
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\jre1.5.0_06\bin\ssv.dll
O9 - Extra 'Tools' menuitem: Sun Java Console - {08B0E5C0-4FCB-11CF-AAA5-00401C608501} - C:\Program Files\Java\jre1.5.0_06\bin\ssv.dll
O9 - Extra button: Yahoo! Services - {5BAB4B5B-68BC-4B02-94D6-2FC0DE4A7897} - C:\Program Files\Yahoo!\Common\yiesrvc.dll
O9 - Extra button: Yahoo! Messenger - {E5D12C4E-7B4F-11D3-B5C9-0050045C3C96} - C:\Program Files\Yahoo!\Messenger\YahooMessenger.exe
O9 - Extra 'Tools' menuitem: Yahoo! Messenger - {E5D12C4E-7B4F-11D3-B5C9-0050045C3C96} - C:\Program Files\Yahoo!\Messenger\YahooMessenger.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
O12 - Plugin for .spop: C:\Program Files\Internet Explorer\Plugins\NPDocBox.dll
O16 - DPF: {6414512B-B978-451D-A0D8-FCFDF33E833C} (WUWebControl Class) - http://update.microsoft.com/microsoftupdate/v6/V5Controls/en/x86/client/wuweb_site.cab?1158720873766
O16 - DPF: {6E32070A-766D-4EE6-879C-DC1FA91D2FC3} (MUWebControl Class) - http://update.microsoft.com/microsoftupdate/v6/V5Controls/en/x86/client/muweb_site.cab?1158720862139
O16 - DPF: {78AF2F24-A9C3-11D3-BF8C-0060B0FCC122} (AcDcToday Control) - file://C:\Program Files\AutoCAD 2002\AcDcToday.ocx
O16 - DPF: {AE563720-B4F5-11D4-A415-00108302FDFD} (NOXLATE-BANR) - file://C:\Program Files\AutoCAD 2002\InstBanr.ocx
O16 - DPF: {C6637286-300D-11D4-AE0A-0010830243BD} (InstaFred) - file://C:\Program Files\AutoCAD 2002\InstFred.ocx
O16 - DPF: {F281A59C-7B65-11D3-8617-0010830243BD} (AcPreview Control) - file://C:\Program Files\AutoCAD 2002\AcPreview.ocx
O20 - Winlogon Notify: WgaLogon - WgaLogon.dll (file missing)
O23 - Service: Ati HotKey Poller - Unknown owner - C:\WINDOWS\System32\Ati2evxx.exe
O23 - Service: Fix-It Task Manager - Avanquest Publishing USA, Inc. - C:\PROGRA~1\VCOM\Fix-It\mxtask.exe
O23 - Service: InstallDriver Table Manager (IDriverT) - Macrovision Corporation - C:\Program Files\Common Files\InstallShield\Driver\11\Intel 32\IDriverT.exe
O23 - Service: iPodService - Apple Computer, Inc. - C:\Program Files\iPod\bin\iPodService.exe
O23 - Service: Trend Micro Central Control Component (PcCtlCom) - Trend Micro Inc. - C:\PROGRA~1\TRENDM~1\INTERN~1\PcCtlCom.exe
O23 - Service: Trend Micro Protection Against Spyware (PcScnSrv) - Trend Micro Inc. - C:\PROGRA~1\TRENDM~1\INTERN~1\PcScnSrv.exe
O23 - Service: Trend Micro Real-time Service (Tmntsrv) - Trend Micro Inc. - C:\PROGRA~1\TRENDM~1\INTERN~1\Tmntsrv.exe
O23 - Service: Trend Micro Personal Firewall (TmPfw) - Trend Micro Inc. - C:\PROGRA~1\TRENDM~1\INTERN~1\TmPfw.exe
O23 - Service: Trend Micro Proxy Service (tmproxy) - Trend Micro Inc. - C:\PROGRA~1\TRENDM~1\INTERN~1\tmproxy.exe
O23 - Service: WLTRYSVC - Unknown owner - C:\WINDOWS\System32\wltrysvc.exe