Used Computer.. Clicking Sound

Hey all, my old computer's hard drive just recently crashed.. I've been told reinstalling Windows XP is going to fix it.

Anyways, in the meantime, I'm using an old used computer that my dad bought for my grandmother just recently. I'm trying to get it in as good of shape as possible (without bumping up the RAM or any hardware like that).

Recently I've been hearing a clicking noise through the speakers - not anything physical, it's the sound effect that plays when you click a link or open a new window in IE.. but I'm using firefox.

I'm wondering if this could be some kind of spyware that I could fix easily via HJT rather than having to run a time and resource consuming spware blasting program.

See if you can come up with anything, thanks!

Logfile of HijackThis v1.99.1
Scan saved at 6:27:59 PM, on 6/26/2007
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\svchost.exe
C:\WINDOWS\System32\svchost.exe
C:\WINDOWS\system32\brsvc01a.exe
C:\WINDOWS\system32\brss01a.exe
C:\WINDOWS\system32\spoolsv.exe
C:\Program Files\Alwil Software\Avast4\aswUpdSv.exe
C:\Apps\Maintenance\PurgeIE\PurgPro_Service.exe
C:\WINDOWS\Explorer.EXE
C:\Program Files\Java\jre1.6.0_01\bin\jusched.exe
C:\WINDOWS\system32\wuauclt.exe
C:\WINDOWS\system32\BRSPL01A.EXE
C:\PROGRA~1\MOZILL~1\FIREFOX.EXE
C:\Program Files\AIM\aim.exe
C:\WINDOWS\system32\NOTEPAD.EXE
C:\Program Files\HijackThis\HijackThis.exe

R1 - HKCU\Software\Microsoft\Internet Explorer\Main,Search Bar = http://www.yahoo.com/search/ie.html
R1 - HKCU\Software\Microsoft\Internet Explorer\Main,Search Page = http://hp.yahoo.com
R0 - HKCU\Software\Microsoft\Internet Explorer\Main,Start Page = http://hp.my.yahoo.com
R1 - HKLM\Software\Microsoft\Internet Explorer\Main,Default_Page_URL = http://hp.my.yahoo.com
R1 - HKLM\Software\Microsoft\Internet Explorer\Main,Default_Search_URL = http://hp.yahoo.com
R1 - HKLM\Software\Microsoft\Internet Explorer\Main,Search Bar = http://www.yahoo.com/ext/search/search.html
R1 - HKLM\Software\Microsoft\Internet Explorer\Main,Search Page = http://hp.yahoo.com
R0 - HKLM\Software\Microsoft\Internet Explorer\Main,Start Page = http://hp.my.yahoo.com
R0 - HKLM\Software\Microsoft\Internet Explorer\Search,SearchAssistant = http://channels.aimtoday.com/search/aimtoolbar.jsp
R0 - HKLM\Software\Microsoft\Internet Explorer\Main,Local Page = C:\WINDOWS\SYSTEM\blank.htm
R1 - HKCU\Software\Microsoft\Windows\CurrentVersion\Internet Settings,ProxyOverride = localhost
O2 - BHO: SSVHelper Class - {761497BB-D6F0-462C-B6EB-D4DAF1D92D43} - C:\Program Files\Java\jre1.6.0_01\bin\ssv.dll
O2 - BHO: Viewpoint Toolbar BHO - {A7327C09-B521-4EDB-8509-7D2660C9EC98} - C:\Program Files\Viewpoint\Viewpoint Toolbar\ViewBarBHO.dll
O2 - BHO: (no name) - {A8FB8EB3-183B-4598-924D-86F0E5E37085} - (no file)
O3 - Toolbar: Viewpoint Toolbar - {F8AD5AA5-D966-4667-9DAF-2561D68B2012} - C:\Program Files\Viewpoint\Viewpoint Toolbar\ViewBar.dll
O4 - HKLM\..\Run: [SystemTray] SysTray.Exe
O4 - HKLM\..\Run: [avast!] C:\PROGRA~1\ALWILS~1\Avast4\ashDisp.exe
O4 - HKLM\..\Run: [SunJavaUpdateSched] "C:\Program Files\Java\jre1.6.0_01\bin\jusched.exe"
O4 - HKLM\..\RunServices: [Keyboard Manager] C:\Program Files\Netropa\One-touch Multimedia Keyboard\MMKeybd.exe
O4 - HKCU\..\Run: [AIM] C:\Program Files\AIM\aim.exe -cnetwait.odl
O8 - Extra context menu item: E&xport to Microsoft Excel - res://C:\PROGRA~1\MI1933~1\Office10\EXCEL.EXE/3000
O9 - Extra button: AIM - {AC9E2541-2814-11d5-BC6D-00B0D0A1DE45} - C:\Program Files\AIM\aim.exe
O9 - Extra button: Messenger - {FB5F1910-F110-11d2-BB9E-00C04F795683} - C:\Program Files\Messenger\msmsgs.exe

PS:

I fixed these two entries after making my initial log.
O4 - HKCU\..\Run: [MoneyAgent] "C:\Program Files\Microsoft Money\System\Money Express.exe"
O4 - HKLM\..\Run: [PCPitStopEraser] C:\Program Files\PCPitstop\Erase\PCPitStopErase.exe /remindme