Cpu spiking problems and network problems

I've had a cpu problem for quite some time now, whenever i do even a little task like using my mouse scroller in internet explorer my cpu usage shoots up to 80 - 100% within the task bar for that process in this case internet explorer. i have up to date mcafee and scan regularly as well as using ad-aware and spybot and my pc seems clean, also used trojanhunter and all found nothing. i defrag and disk check regularly also. i have searched the web for days for a solution and found nothing that worked. this cpu proplem effects my games, programs, everything. my spec is as follows
Windows xp home edition with service pack 2
radeon 9200 pro 128mg
p4 1.7
512 megs of ram
soundblaster live
Maxtor 4DO80H4 disk drive, 80 gbs, 2 partitions D + C
Lucent winmodem
Accton EN1207D Series PCI Fast Ethernet Adapter

the network card i received of my freind it is an old network card and theres seems to be one problem within device manager within network adapter theres hardware thats called microsoft tun miniport adapter #2, and no idea where it came from it says the device cannot start. other than that everything seems fine.

i am also having network lag on my lan in galway, its a campus that i live in and i use the network card to hook up to the port with a cat5.

i really cant find a solution for my problems and i know alot about computers myself, any help would be appriciated.

i have also found two strange things in my pc, i have 6 instances of svchost.exe running in my task manager, and something i spotted just a minute ago, when i go to system restore, and click system restore settings mcafee detects a suspicious script in this file d:\windows\system32\restore\rstrui.exe. but when i scan the windows folder its not there??!

think il go punch a wall for a while

updated this message with a log from hijackthis program, may be of some help

Logfile of HijackThis v1.97.7
Scan saved at 13:26:19, on 27/09/2004
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\spoolsv.exe
d:\PROGRA~1\mcafee.com\vso\mcvsrte.exe
\WINDOWS\System32\tcpsvcs.exe
\WINDOWS\system32\svchost.exe
d:\PROGRA~1\mcafee.com\vso\mcshield.exe
\WINDOWS\system32\Ati2evxx.exe
\WINDOWS\Explorer.EXE
\PROGRA~1\mcafee.com\vso\mcvsshld.exe
\PROGRA~1\mcafee.com\agent\mcagent.exe
d:\progra~1\mcafee.com\vso\mcvsescn.exe
\WINDOWS\system32\ctfmon.exe
\Program Files\Internet Explorer\iexplore.exe
\Program Files\Winamp\winamp.exe
\Program Files\Steam\Steam.exe
C:\mIRC\mirc.exe
\Program Files\Internet Explorer\iexplore.exe
C:\Downloads\HijackThis.exe

R0 - HKCU\Software\Microsoft\Internet Explorer\Main,Start Page = http://www.google.ie/
R1 - HKCU\Software\Microsoft\Internet Explorer\Main,Default_Page_URL = http://home.iol.ie
O2 - BHO: (no name) - {06849E9F-C8D7-4D59-B87D-784B7D6BE0B3} - \Program Files\Adobe\Acrobat 6.0\Reader\ActiveX\AcroIEHelper.dll (disabled by BHODemon)
O3 - Toolbar: McAfee VirusScan - {BA52B914-B692-46c4-B683-905236F6F655} - d:\progra~1\mcafee.com\vso\mcvsshl.dll
O4 - HKLM\..\Run: [VSOCheckTask] "d:\PROGRA~1\mcafee.com\vso\mcmnhdlr.exe" /checktask
O4 - HKLM\..\Run: [VirusScan Online] "d:\PROGRA~1\mcafee.com\vso\mcvsshld.exe"
O4 - HKLM\..\Run: [MCAgentExe] d:\PROGRA~1\mcafee.com\agent\mcagent.exe
O4 - HKLM\..\Run: [MCUpdateExe] \PROGRA~1\McAfee.com\Agent\McUpdate.exe
O4 - HKLM\..\Run: [MSConfig] \WINDOWS\PCHealth\HelpCtr\Binaries\MSConfig.exe /auto
O4 - HKCU\..\Run: [ctfmon.exe] \WINDOWS\system32\ctfmon.exe
O9 - Extra button: Messenger (HKLM)
O9 - Extra 'Tools' menuitem: Windows Messenger (HKLM)
O16 - DPF: {0A5FD7C5-A45C-49FC-ADB5-9952547D5715} (Creative Software AutoUpdate) - http://www.creative.com/su/ocx/12119/CTSUEng.cab
O16 - DPF: {39B0684F-D7BF-4743-B050-FDC3F48F7E3B} (FilePlanet Download Control Class) - http://www.fileplanet.com/fpdlmgr/cabs/FPDC_1_0_0_44.cab
O16 - DPF: {4ED9DDF0-7479-4BBE-9335-5A1EDB1D8A21} (McAfee.com Operating System Class) - http://bin.mcafee.com/molbin/shared/mcinsctl/en-gb/4,0,0,83/mcinsctl.cab
O16 - DPF: {54B52E52-8000-4413-BD67-FC7FE24B59F2} (EARTPatchX Class) - http://www.ea.com/downloads/rtpatch/EARTPX.cab
O16 - DPF: {9F1C11AA-197B-4942-BA54-47A8489BB47F} - http://v4.windowsupdate.microsoft.com/CAB/x86/unicode/iuctl.CAB?38080.2072222222
O16 - DPF: {BCC0FF27-31D9-4614-A68E-C18E1ADA4389} (DwnldGroupMgr Class) - http://bin.mcafee.com/molbin/shared/mcgdmgr/en-gb/1,0,0,20/mcgdmgr.cab
O16 - DPF: {D27CDB6E-AE6D-11CF-96B8-444553540000} (Shockwave Flash Object) - http://download.macromedia.com/pub/shockwave/cabs/flash/swflash.cab
O16 - DPF: {F6ACF75C-C32C-447B-9BEF-46B766368D29} (Creative Software AutoUpdate Support Package) - http://www.creative.com/su/ocx/12119/CTPID.cab

LegacyUser

is the indexing service running, it can be a bit of a resource hogger