I unchecked "use as little cpu power as possible", and from a cold boot, with no other apps in use, it took 1.5 hours to get down to 3 threads, at which time I aborted it.
This is a list of running processes. Any of these possibly responsible?
PID: 424 (4) \SystemRoot\System32\smss.exe
PID: 492 (480) C:\Windows\system32\csrss.exe
PID: 536 (480) C:\Windows\system32\wininit.exe
PID: 548 (528) C:\Windows\system32\csrss.exe
PID: 580 (536) C:\Windows\system32\services.exe
PID: 596 (536) C:\Windows\system32\lsass.exe
PID: 604 (536) C:\Windows\system32\lsm.exe
PID: 692 (528) C:\Windows\system32\winlogon.exe
PID: 804 (580) C:\Windows\system32\svchost.exe
PID: 868 (580) C:\Windows\system32\svchost.exe
PID: 904 (580) C:\Windows\System32\svchost.exe
PID: 964 (580) C:\Windows\System32\svchost.exe
PID: 1032 (580) C:\Windows\System32\svchost.exe
PID: 1060 (580) C:\Windows\system32\svchost.exe
PID: 1200 (580) C:\Windows\system32\SLsvc.exe
PID: 1244 (580) C:\Windows\system32\svchost.exe
PID: 1400 (580) C:\Windows\system32\svchost.exe
PID: 1552 (580) C:\Program Files\Alwil Software\Avast4\aswUpdSv.exe
PID: 1628 (580) C:\Program Files\Alwil Software\Avast4\ashServ.exe
PID: 1772 (1032) C:\Windows\system32\Dwm.exe
PID: 1832 (1756) C:\Windows\Explorer.EXE
PID: 2032 (580) C:\Windows\System32\spoolsv.exe
PID: 268 (580) C:\Windows\system32\svchost.exe
PID: 332 (1060) C:\Windows\system32\taskeng.exe
PID: 1620 (1832) C:\Windows\System32\igfxpers.exe
PID: 1580 (1832) C:\Windows\System32\rundll32.exe
PID: 1572 (1832) C:\Program Files\Gigaware\Gigaware Driver\4.06\Mouse32A.exe
PID: 1524 (1832) C:\Program Files\QuickMenu\QuickMenuPlus.exe
PID: 1812 (1832) C:\Program Files\Alwil Software\Avast4\ashDisp.exe
PID: 640 (1832) C:\Program Files\Synaptics\SynTP\SynTPEnh.exe
PID: 1676 (1832) C:\Program Files\Windows Sidebar\sidebar.exe
PID: 1760 (1832) C:\Program Files\Spybot - Search & Destroy\TeaTimer.exe
PID: 1104 (1832) C:\Program Files\Mobile Master\MMAgent.exe
PID: 2056 (1676) C:\Program Files\Windows Sidebar\sidebar.exe
PID: 2072 (1832) C:\Program Files\Windows Media Player\wmpnscfg.exe
PID: 2100 (1832) C:\Program Files\WIDCOMM\Bluetooth Software\BTTray.exe
PID: 2128 (1832) C:\Program Files\Microsoft\Feeds Plus for Windows\feedsplus.exe
PID: 2304 (1104) C:\Program Files\Mobile Master\MMScan.exe
PID: 2680 (580) C:\Windows\system32\svchost.exe
PID: 2736 (580) C:\Program Files\Intel\Wireless\Bin\EvtEng.exe
PID: 2768 (580) C:\Program Files\Common Files\Microsoft Shared\VS7DEBUG\mdm.exe
PID: 2924 (580) c:\Program Files\Microsoft SQL Server\MSSQL.2\MSSQL\Binn\sqlservr.exe
PID: 2940 (804) C:\Program Files\WIDCOMM\Bluetooth Software\BtStackServer.exe
PID: 2996 (580) c:\Program Files\Microsoft SQL Server\MSSQL.1\MSSQL\Binn\sqlservr.exe
PID: 3092 (580) C:\Windows\system32\svchost.exe
PID: 3108 (580) C:\Program Files\Dell Support Center\bin\sprtsvc.exe
PID: 3156 (580) c:\Program Files\Microsoft SQL Server\90\Shared\sqlbrowser.exe
PID: 3172 (580) c:\Program Files\Microsoft SQL Server\90\Shared\sqlwriter.exe
PID: 3192 (580) C:\Windows\system32\svchost.exe
PID: 3228 (580) C:\Windows\System32\svchost.exe
PID: 3256 (580) C:\Windows\system32\SearchIndexer.exe
PID: 3912 (580) C:\Program Files\Alwil Software\Avast4\ashMaiSv.exe
PID: 3968 (580) C:\Program Files\Alwil Software\Avast4\ashWebSv.exe
PID: 1096 (1060) C:\Windows\system32\taskeng.exe
PID: 3068 (804) C:\Windows\system32\wbem\wmiprvse.exe
PID: 2712 (804) C:\Windows\system32\wbem\unsecapp.exe
PID: 4152 (580) C:\Program Files\Windows Live\installer\WLSetupSvc.exe
PID: 4960 (580) C:\Program Files\Windows Live\Messenger\usnsvc.exe
PID: 2400 (5748) C:\Program Files\Windows Live\Messenger\msnmsgr.exe
PID: 3628 (1760) C:\Program Files\Spybot - Search & Destroy\SpybotSD.exe
PID: 0 (0)
PID: 4 (0) System
PID: 1164 (964) audiodg.exe