Random CPU Usage spikes

Hi,
In the last couple of days, I've been having random CPU usage spiking. Every 10 seconds or so, my CPU usage spikes 40-50% without anything actually running. When i do run something, everything lags for a second and then continues on, repeating. I can't figure out what it is. I've formatted my entire hard drive twice now (thinking it was FFDShow) but with this fresh install, it still occurs. All I have loaded are Winamp, Microsoft Office, Firefox, AIM, Daemon Tools, MVP Baseball 2005, Windows MEdia Player classic and a couple of Adobe programs. Anyone have any ideas what might be causing these spikes? Here's my hijack log if it helps:

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:\WINDOWS\Explorer.EXE
C:\Program Files\ANI\ANIWZCS2 Service\WZCSLDR2.exe
C:\Program Files\ANI\ANIWZCS2 Service\ANIWZCSdS.exe
C:\WINDOWS\system32\devldr32.exe
C:\WINDOWS\System32\svchost.exe
C:\Program Files\mplayerc.exe
C:\WINDOWS\system32\divxsm.exe
C:\Program Files\Mozilla Firefox\firefox.exe
C:\WINDOWS\system32\msiexec.exe
C:\Documents and Settings\Evan\Desktop\HiJackThis_v2.exe

O4 - HKLM\..\Run: [ANIWZCS2Service] C:\Program Files\ANI\ANIWZCS2 Service\WZCSLDR2.exe
O4 - HKLM\..\Run: [MSConfig] C:\WINDOWS\PCHealth\HelpCtr\Binaries\MSConfig.exe /auto
O9 - Extra button: Research - {92780B25-18CC-41C8-B9BE-3C9C571A8263} - C:\PROGRA~1\MICROS~2\Office12\REFIEBAR.DLL
O9 - Extra button: AIM - {AC9E2541-2814-11d5-BC6D-00B0D0A1DE45} - C:\PROGRA~1\AIM\aim.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
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: Adobe LM Service - Adobe Systems - C:\Program Files\Common Files\Adobe Systems Shared\Service\Adobelmsvc.exe
O23 - Service: ANIWZCSd Service (ANIWZCSdService) - Alpha Networks Inc. - C:\Program Files\ANI\ANIWZCS2 Service\ANIWZCSdS.exe