Need Major Computer Help

[JustinRhodes]

I just got this computer from my aunt a couple days ago. i think that its infected with virus's or whatever. im wanting to buy stuff online for my truck but i dont feel safe using my credit card on this computer. anyways one of the problems is it is lagging REALLY bad sometimes and is just all around slow.another is it randomly freezes on me. and sometimes when it starts up it just freezes on me. another problem is before i system restored it kept saying hard drive was missing. wouldnt let me open anything. anyways i just want my computer running correctly and without having to worry about getting my credit card info stolen.
ive been told to post my hijackthis log on here so here it is.

Logfile of Trend Micro HijackThis v2.0.4
Scan saved at 6:42:02 PM, on 1/22/2011
Platform: Windows XP SP3 (WinNT 5.01.2600)
MSIE: Internet Explorer v7.00 (7.00.6000.17093)
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\svchost.exe
C:\WINDOWS\System32\svchost.exe
C:\WINDOWS\system32\spoolsv.exe
C:\Program Files\Immunet Protect\2.0.17\agent.exe
C:\Program Files\Common Files\Motive\McciCMService.exe
C:\WINDOWS\Explorer.EXE
C:\WINDOWS\system32\ctfmon.exe
C:\Program Files\Mozilla Firefox\firefox.exe
C:\Program Files\Mozilla Firefox\plugin-container.exe
C:\Program Files\Trend Micro\HiJackThis\HiJackThis.exe

R0 - HKCU\Software\Microsoft\Internet Explorer\Main,Start Page = http://www.yahoo.com/
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
R0 - HKLM\Software\Microsoft\Internet Explorer\Search,SearchAssistant =
R0 - HKLM\Software\Microsoft\Internet Explorer\Search,CustomizeSearch =
R3 - URLSearchHook: (no name) - {0EBBBE48-BAD4-4B4C-8E5A-516ABECAE064} - (no file)
O2 - BHO: SSVHelper Class - {761497BB-D6F0-462C-B6EB-D4DAF1D92D43} - C:\Program Files\Java\jre1.6.0_07\bin\ssv.dll
O4 - HKLM\..\Run: [Malwarebytes Anti-Malware (reboot)] "S:\app\m1b2\m1b2a3m4r5u6n7.exe" /runcleanupscript
O4 - HKLM\..\Run: [Malwarebytes' Anti-Malware] c:\compaq\app\m1b2\mbamgui.exe /starttray
O4 - HKLM\..\Run: [Immunet Protect] "C:\Program Files\Immunet Protect\2.0.17\iptray.exe"
O4 - HKCU\..\Run: [MSMSGS] "C:\Program Files\Messenger\msmsgs.exe" /background
O4 - HKCU\..\Run: [ctfmon.exe] C:\WINDOWS\system32\ctfmon.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: (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
O15 - Trusted Zone: http://*.mcafee.com
O18 - Protocol: dssrequest - {5513F07E-936B-4E52-9B00-067394E91CC5} - (no file)
O22 - SharedTaskScheduler: Browseui preloader - {438755C2-A8BA-11D1-B96B-00A0C90312E1} - C:\WINDOWS\system32\browseui.dll
O22 - SharedTaskScheduler: Component Categories cache daemon - {8C7461EF-2B13-11d2-BE35-3078302C2030} - C:\WINDOWS\system32\browseui.dll
O23 - Service: Immunet Protect (ImmunetProtect) - Immunet Corporation - C:\Program Files\Immunet Protect\2.0.17\agent.exe
O23 - Service: MBAMService - Unknown owner - c:\compaq\app\m1b2\mbamservice.exe (file missing)
O23 - Service: McciCMService - Alcatel-Lucent - C:\Program Files\Common Files\Motive\McciCMService.exe

--
End of file - 3579 bytes

[S Templar]

Hi I am not a Hjt log expert and not really allowed to comment.
But as you have not had an answer to your post for some days...

You do not have an installed and running Anti-virus program running.
McAfee is listed in Trusted Zones and you once had their Site Advisor installed.

Install a new Anti-virus program and update it and then scan your Pc.

Hopefully our Hjt log expert will soon check your Hjt log.

[JustinRhodes]

anyone have any idea how long this will take? not rushing or anything but im about to take to a computer guy to fix it.

[S Templar]

Have you installed a new Anti-virus program?
The longer without one – you will become infected.

Have you updated your Malwarebytes program and scanned your pc with it?

Download - http://www.superantispyware.com/
D/load - update – scan you pc.

Also run an online scan – just as another virus check.
http://housecall.trendmicro.com/uk/

D/load Ccleaner – to clean out all temp files etc
Best not to use the Registry cleaner.
http://www.piriform.com/

Lets us have some pc specs.
Hard drive size – free space?
Installed Ram. etc