Windows 7, random sounds..virus?

Hello Icrontic! It's been a long time, but I'm back. Why? Cause I have a problem I couldn't solve by myself. :o

Every so often (could be a couple a couple seconds, to minutes or hours) my computer will play seemingly random sounds. I've heard a few different ones so far. One is a short clip of a female screaming, another is a man laughing (diabolically! ) and most common is a clip of some song from a guitar. There are no set intervals and I can't recreate this problem. My computer (old as it is) doesn't even slow down while the sounds play. Any help would be much appreciated!

Thanks,
Rick

I've always hated looking through these logs..wall of text inc

Logfile of Trend Micro HijackThis v2.0.3 (BETA)
Scan saved at 12:44:45 PM, on 2/18/2010
Platform: Unknown Windows (WinNT 6.01.3504)
MSIE: Internet Explorer v8.00 (8.00.7600.16385)
Boot mode: Normal

Running processes:
C:\Windows\Explorer.EXE
C:\Windows\system32\taskhost.exe
C:\Windows\system32\Dwm.exe
D:\Program Files\iTunes\iTunesHelper.exe
C:\Windows\SOUNDMAN.EXE
C:\Program Files\Java\jre6\bin\jusched.exe
D:\Program Files\Logitech\SetPoint\SetPoint.exe
C:\Program Files\Common Files\Logishrd\KHAL2\KHALMNPR.EXE
C:\Program Files\AIM\aim.exe
D:\utorrent.exe
D:\Program Files\Mozilla Firefox\firefox.exe
C:\Program Files\TrendMicro\HiJackThis\HiJackThis.exe

R1 - HKCU\Software\Microsoft\Internet Explorer\Main,Search Page = http://go.microsoft.com/fwlink/?LinkId=54896
R0 - HKCU\Software\Microsoft\Internet Explorer\Main,Start Page = http://go.microsoft.com/fwlink/?LinkId=69157
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 =
R1 - HKCU\Software\Microsoft\Windows\CurrentVersion\Internet Settings,ProxyOverride = *.local
R0 - HKCU\Software\Microsoft\Internet Explorer\Toolbar,LinksFolderName =
O2 - BHO: (no name) - {5C255C8A-E604-49b4-9D64-90988571CECB} - (no file)
O2 - BHO: Symantec Intrusion Prevention - {6D53EC84-6AAE-4787-AEEE-F4628F01010C} - D:\Program Files\Norton AntiVirus\Engine\17.5.0.127\IPSBHO.DLL
O2 - BHO: Windows Live Sign-in Helper - {9030D464-4C02-4ABF-8ECC-5164760863C6} - C:\Program Files\Common Files\Microsoft Shared\Windows Live\WindowsLiveLogin.dll
O2 - BHO: Java(tm) Plug-In 2 SSV Helper - {DBC80044-A445-435b-BC74-9C25C1C588A9} - C:\Program Files\Java\jre6\bin\jp2ssv.dll
O4 - HKLM\..\Run: [QuickTime Task] "C:\Program Files\QuickTime\QTTask.exe" -atboottime
O4 - HKLM\..\Run: [iTunesHelper] "D:\Program Files\iTunes\iTunesHelper.exe"
O4 - HKLM\..\Run: [Kernel and Hardware Abstraction Layer] KHALMNPR.EXE
O4 - HKLM\..\Run: [SoundMan] SOUNDMAN.EXE
O4 - HKLM\..\Run: [SunJavaUpdateSched] "C:\Program Files\Java\jre6\bin\jusched.exe"
O4 - HKCU\..\Run: [AlcoholAutomount] "C:\Program Files\Alcohol Soft\Alcohol 120\axcmd.exe" /automount
O4 - HKCU\..\RunOnce: [FlashPlayerUpdate] C:\Windows\system32\Macromed\Flash\NPSWF32_FlashUtil.exe -p
O4 - Global Startup: Logitech SetPoint.lnk = D:\Program Files\Logitech\SetPoint\SetPoint.exe
O13 - Gopher Prefix:
O16 - DPF: {E2883E8F-472F-4FB0-9522-AC9BF37916A7} - http://platformdl.adobe.com/NOS/getPlusPlus/1.6/gp.cab
O17 - HKLM\System\CCS\Services\Tcpip\..\{3AE1924A-FDBC-4701-BDDB-7C609468106D}: NameServer = 10.1.10.2,4.2.2.2
O23 - Service: Apple Mobile Device - Apple Inc. - C:\Program Files\Common Files\Apple\Mobile Device Support\bin\AppleMobileDeviceService.exe
O23 - Service: Bonjour Service - Apple Inc. - C:\Program Files\Bonjour\mDNSResponder.exe
O23 - Service: iPod Service - Apple Inc. - C:\Program Files\iPod\bin\iPodService.exe
O23 - Service: Logitech Bluetooth Service (LBTServ) - Logitech, Inc. - C:\Program Files\Common Files\Logishrd\Bluetooth\LBTServ.exe
O23 - Service: Norton AntiVirus (NAV) - Symantec Corporation - D:\Program Files\Norton AntiVirus\Engine\17.5.0.127\ccSvcHst.exe
O23 - Service: NetLimiter 3 Service (nlsvc) - Locktime Software - C:\Program Files\NetLimiter 3\nlsvc.exe
O23 - Service: StarWind AE Service (StarWindServiceAE) - Rocket Division Software - C:\Program Files\Alcohol Soft\Alcohol 120\StarWind\StarWindServiceAE.exe

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