Toshiba Satellite 2455-S305

click start control panel view devices and printers you should see your web cam from there
if you are have trouble with your web cam

click start control panel administrative tools ,computer management ,device manager scroll down

image devices you could see a yellow question mark ? right click to reinstall drivers or update driver

click start control panel sounds and audio devices select advanced there might be a tick in the mute box untick it or select audio from the microphone drop down list make sure you have the right one selected and in the volume box make sure the microphone box has a tick in it or select

the voice tab and make sure that you have the right media selected also select volume make sure the box for microphone has a tick in it

hope it helps

which message program skype or yahoo messenger .........

will need to know to find out settings for a mic
click start control panel sounds and audio devices audio and also voice its the same make sure that you have the right default microphone selected you should be able scroll to video settings to make sure you have the right settings
click start control panel sounds and audio devices select advanced there might be a tick in the mute box untick also

select audio from the microphone drop down list make sure you have the right one selected and in the volume box make sure the microphone box has a tick in it or

select the voice tab and make sure that you have the right media selected also select volume make sure the box for microphone has a tick in it

hope it helps

Sorry to read about your problem, I hope this helps you out.

Remove the lid of the tray.
If the media pressure plate is raised, press down the media pressure plate to lock it into place.
Squeeze the media guide (length) and slide it to the desired size.
Squeeze the media guide (width) and slide it to the desired size.
Loading Media
Load the paper face up in the tray.
Do not load the paper above the ↑ mark. For the informa-
tion on the tray capacity for each media,
Reattach the lid of the tray.

I tried to help you. Please help me and Rate/Vote on my response, thanks and good luck

From TEAC Germany comes the answer

W7 has windows media center. In it you find TV. That will run the teac stick. done it - works.
---- original answer (German)
Der DVBT-101 wurde ursprünglich für Windows Vista entwickelt und ist im Zusammenhang mit der Software TV-Jukebox 3.0 oder 3.1 nur unter diesem Betriebssystem lauffähig. Es gibt inzwischen die Version 3.5, diese allerdings ist nur für den Betrieb von DVBT High Definition Sticks ausgelegt und ist nicht mit unseren Installationscodes kompatibel. Bei Windows 7 ist standardmäßig das Windows Media Center vorinstalliert, dies verfügt über einen Punk "TV" über den der DVBT-101 problemlos betrieben werden kann.

I'm not sure whether this is the exact same problem, as I was having, but mine just randomly quit while I was listening to music this morning. I got messages saying "No audio device installed", but when I went to device manager, all my audio devices said they were working properly. If this is the case with you, simply restart your computer. It may take a couple restarts, but this should work. My sound was back even before it finished shutting down.

If it helps anyone trying to get to the root of this problem, I am running XP on a Dell B130 laptop, with the following devices listed in Device Manager:
Audio Codecs
Legacy Audio Drivers
Legacy Video Capture Devices
Media Control Devices
SigmaTel High Definition Audio CODEC
Video Codecs
Hope this helps!