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Friend i think it was because of sound driver just go to control panel->sound and audio devices->see if all sounds are in full max then check properties of sound driver and see if that is working properly and finally update the driver and restart the system if problem persisits ask me again.
if you are runninf windows XP VISTA or 7 you can right click on the sound icon in the system tray on the taskbar and select "Playback Devices" select the audio output you are using ( speakers, HDMI or optical ... the one theat has a hreen checkup icon ar the bottom right side of the symbol is the default one ) push the "Properties" button ... the properties window will appear. In the prop window go to the "Enhancements" tab ( normally the fourth one ) and uncheck the "Voice cancellation" checkbox.click Apply than OK, then again OK. If you don't have the Sound icon in the SysTray just go to control panel, hardware and sound, Sound and do the same. The other way around is from The ACER HD Audio Manager ( the audio driver interface that can be also be found in Control Pannel ->> Hardware and sound ->> Acer HD Audio Manager( "Control Pannel Home" view ) or simply Control Pannel->> Acer HD Audio Manager(classic view of control pannel). In the Acer HD Audio Manager go to the "Sound Effects" tab ( the second usually ) and there is a Karaoke option; if it has a red mark in the mouth are than click on the karaoke icon ... it is the equivalent of voice cancellation from the Enhancements tab from Sound ->> Properties. In Linux go to System ->> Administration ->> Sound configuration or something like that and you should find a close match for windows voice cancellation. For any further assistance contact me at email@example.com.
CHECK IF THE SOUND DRIVER HAS INSTALLED PROPERLY OR THE ONBOARD SOUNDCARD HAS BEEN DETECTED OR NOT.IF NOT DETECTED TRY THIS:
1.INSTALL XP AGAIN.
2.TRY REMOVING ALL SOUND RELATED APPLICATIONS AND RESTART THE MACHINE SEVERAL TIMES.
reinstall the drivers, or go to your adminstrative tools in the control pannel and then computer managment, and then services and applications, inside you will find a list on services on your computer, find you cam and check its settings, you can also go to control pannel, sysytem, hardware and find the cam click on it, it should tell you if it is running correctly, you can also reinstall, the drivers from there
your account/user must be set as guest, you should have it set as an adninistrator, either create yourself a new account or try to change your account type.
If you are unable to set an account as administrator you will have to reinstall windows to set admin up.