Hardware intterupts at 80% cpu, need help

Hi, i just had a new motherboard, nforce 3, new cpu, amd 64 3000+, and new ram 1024 installed in my pc, basically i had a guy put together the pc for me. Installed xp with service pack too and all updates from scratch.
installed avg, all my utilities drivers etc...
look into the task manager and pc starts running slowly, checked to see what the problem was in process explorer and it tells me that Hardware intterupts at around 80% cpu usage all the time. checked pc for viruses and spyware. perfect. all the hardware seems to be working in the device manager. Spent nearly two days now and i have no clue whats going on. tearing my hair out please some1 help me!!

hijack this if any1 needs to see
Logfile of HijackThis v1.99.1
Scan saved at 10:50:44, on 21/06/2006
Platform: Windows XP SP2 (WinNT 5.01.2600)
MSIE: Internet Explorer v6.00 SP2 (6.00.2900.2180)

Running processes:
\WINDOWS\System32\smss.exe
\WINDOWS\system32\winlogon.exe
\WINDOWS\system32\services.exe
\WINDOWS\system32\lsass.exe
\WINDOWS\system32\Ati2evxx.exe
\WINDOWS\system32\svchost.exe
\WINDOWS\System32\svchost.exe
\WINDOWS\system32\acs.exe
\WINDOWS\system32\Ati2evxx.exe
\WINDOWS\system32\devldr32.exe
\WINDOWS\Explorer.EXE
\WINDOWS\system32\spoolsv.exe
\WINDOWS\SOUNDMAN.EXE
\PROGRA~1\Grisoft\AVGFRE~1\avgcc.exe
\PROGRA~1\Grisoft\AVGFRE~1\avgemc.exe
\Program Files\ATI Technologies\ATI.ACE\cli.exe
\Program Files\Common Files\Real\Update_OB\realsched.exe
\WINDOWS\system32\ctfmon.exe
\Program Files\108Mbps Wireless LAN Adapter\WLANPRO.exe
\PROGRA~1\Grisoft\AVGFRE~1\avgamsvr.exe
\PROGRA~1\Grisoft\AVGFRE~1\avgupsvc.exe
\WINDOWS\Microsoft.NET\Framework\v2.0.50727\mscorsvw.exe
\Program Files\ATI Technologies\ATI.ACE\cli.exe
\Program Files\Internet Explorer\iexplore.exe
\Program Files\Internet Explorer\iexplore.exe
\Program Files\Internet Explorer\iexplore.exe
\Program Files\Internet Explorer\iexplore.exe
\WINDOWS\system32\taskmgr.exe
\Documents and Settings\MicahelJ\Desktop\hijackthis\HijackThis.exe

R0 - HKCU\Software\Microsoft\Internet Explorer\Main,Start Page = http://www.google.ie/
R1 - HKCU\Software\Microsoft\Internet Connection Wizard,ShellNext = http://windowsupdate.microsoft.com/
O2 - BHO: AcroIEHlprObj Class - {06849E9F-C8D7-4D59-B87D-784B7D6BE0B3} - \Program Files\Adobe\Acrobat 7.0\ActiveX\AcroIEHelper.dll
O4 - HKLM\..\Run: [SoundMan] SOUNDMAN.EXE
O4 - HKLM\..\Run: [UpdReg] \WINDOWS\Updreg.exe
O4 - HKLM\..\Run: [AHQInit] \Program Files\Creative\SBLive\Program\AHQInit.exe
O4 - HKLM\..\Run: [AudioHQ] \Program Files\Creative\SBLive\AudioHQ\AHQTB.EXE
O4 - HKLM\..\Run: [NeroCheck] \WINDOWS\system32\NeroCheck.exe
O4 - HKLM\..\Run: [AVG7_CC] \PROGRA~1\Grisoft\AVGFRE~1\avgcc.exe /STARTUP
O4 - HKLM\..\Run: [AVG7_EMC] \PROGRA~1\Grisoft\AVGFRE~1\avgemc.exe
O4 - HKLM\..\Run: [ATICCC] "D:\Program Files\ATI Technologies\ATI.ACE\cli.exe" runtime -Delay
O4 - HKLM\..\Run: [TkBellExe] "D:\Program Files\Common Files\Real\Update_OB\realsched.exe" -osboot
O4 - HKLM\..\Run: [EPoXUSDM] "D:\Program Files\EPoX\USDM\USDM.EXE" "5000"
O4 - HKCU\..\Run: [CTFMON.EXE] \WINDOWS\system32\ctfmon.exe
O4 - Global Startup: 108Mbps Wireless LAN Adapter Configuration Utility.lnk = ?
O4 - Global Startup: Adobe Reader Speed Launch.lnk = \Program Files\Adobe\Acrobat 7.0\Reader\reader_sl.exe
O4 - Global Startup: Reg.lnk = ?
O9 - Extra button: Messenger - {FB5F1910-F110-11d2-BB9E-00C04F795683} - \Program Files\Messenger\msmsgs.exe
O9 - Extra 'Tools' menuitem: Windows Messenger - {FB5F1910-F110-11d2-BB9E-00C04F795683} - \Program Files\Messenger\msmsgs.exe
O16 - DPF: {6414512B-B978-451D-A0D8-FCFDF33E833C} (WUWebControl Class) - http://update.microsoft.com/windowsupdate/v6/V5Controls/en/x86/client/wuweb_site.cab?1150862830765
O20 - Winlogon Notify: WgaLogon - \WINDOWS\SYSTEM32\WgaLogon.dll
O23 - Service: Atheros Configuration Service (ACS) - Unknown owner - \WINDOWS\system32\acs.exe
O23 - Service: Ati HotKey Poller - ATI Technologies Inc. - \WINDOWS\system32\Ati2evxx.exe
O23 - Service: ATI Smart - Unknown owner - \WINDOWS\system32\ati2sgag.exe
O23 - Service: AVG7 Alert Manager Server (Avg7Alrt) - GRISOFT, s.r.o. - \PROGRA~1\Grisoft\AVGFRE~1\avgamsvr.exe
O23 - Service: AVG7 Update Service (Avg7UpdSvc) - GRISOFT, s.r.o. - \PROGRA~1\Grisoft\AVGFRE~1\avgupsvc.exe
O23 - Service: Sandra Data Service (SandraDataSrv) - SiSoftware - \Program Files\SiSoftware\SiSoftware Sandra Lite 2005.SR3\RpcDataSrv.exe
O23 - Service: Sandra Service (SandraTheSrv) - SiSoftware - \Program Files\SiSoftware\SiSoftware Sandra Lite 2005.SR3\RpcSandraSrv.exe



also here is my full spec

Machine name: MICHAEL-05WO427
Operating System: Windows XP Home Edition (5.1, Build 2600) Service Pack 2 (2600.xpsp_sp2_gdr.050301-1519)
Language: English (Regional Setting: English)
System Manufacturer: NVIDIA
System Model: AWRDACPI
BIOS: Phoenix - AwardBIOS v6.00PG
Processor: AMD Athlon(tm) 64 Processor 3000+, MMX, 3DNow, ~1.8GHz
Memory: 1024MB RAM
Page File: 282MB used, 2178MB available
Windows Dir: \WINDOWS
DirectX Version: DirectX 9.0c (4.09.0000.0904)
DX Setup Parameters: Not found
DxDiag Version: 5.03.2600.2180 32bit Unicode
Radeon 9600xt 128mg
108mps Wireless
Sound Blaster Live 5.1
Maxtor 4d080h4
ide dvd-rom 16x
lite-on-ltr-24102b
Nvidia N Force 3 Motherboard

8T8

Is UDMA mode enabled on your HD ?

Also where the NVIDIA chipset drivers installed ?