Disable all of the following:
Office speech Microsoft Corporation C:\WINDOWS\system32\ctfmon.exe
To disable CTFmon.exe: Control Panel - Regional and Language - Language - Details - Advanced -
Place a checkmark/tick into "Turn off Advanced Text Services"
Disable the Below, via MSCONFIG - StartUp(tab)
admServ.exe Avocent Inc. C:\Acer\Empowering Technology\admServ.exe
LightScribe Hewlett-Packard Company C:\Program Files\Common Files\LightScribe\LSSrvc.exe
Google Update Service Google C:\Program Files\Google\Common\Google Updater ... \GoogleUpdaterService.exe
GoogleToolbarNotifier Google Inc. C:\Program Files\Google\GoogleToolbarNotifier ... \GoogleToolbarNotifier.exe
PSIService C:\WINDOWS\system32\PSIService.exe
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Look inside of your CA ETRUST Antivirus Control/Options to reselect "RealTime" or background scanning. (I don't know what the term is in that companies utility, but look around to see.
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If you cannot "control the volume from keyboard" how are you controlling volume?
Onscreen - TaskBar - Volume Control? Can we presume that you are getting "sound", but just can't control it from Keyboard buttons?
Have you considered Remove/Reinstall the Sound Driver via Device Manager?
A bit more information, per above questions please.
Otherwise, how is your machine performing. Pit test looks fair - good.
Hard drive needs to be Defragged.
Best Regards