Yep, you did post one. Must be going blind here
OK, check and fix these in HijackThis (just testing to see if it's the startup programs causing the problems):
O4 - HKLM\..\Run: [nwiz] nwiz.exe /install
O4 - HKCU\..\Run: [Spyware Doctor] "C:\Program Files\Spyware Doctor\swdoctor.exe" /Q
O4 - HKCU\..\Run: [AIM] C:\PROGRA~1\AIM\aim.exe -cnetwait.odl
O4 - HKCU\..\Run: [MSMSGS] "C:\Program Files\Messenger\msmsgs.exe" /background
O4 - HKCU\..\Run: [ctfmon.exe] C:\WINDOWS\system32\ctfmon.exe
O4 - HKCU\..\Run: [SecretSmileys] C:\PROGRA~1\SECRET~1\ss.exe
O4 - Startup: HA311 Configuration Utility (2).lnk = ?
OK, for that last entry, it's related to your NetGear card. When you have this CPU problem, are you ever connected online? Try disconnecting and see what happens next time.