I got a couple of virus infected my PC a week ago (Essential Cleaner & MS Removal Tool). I had to download instructions on how to remove such virus on the internet. I managed to remove the first virus (Essential Cleaner) from my PC and the sytem works well after the removal. 2 days after another virus infected my pc (MS Removal Tool) i also managed to remove the virus (both through the registry edit and some applications from the net) but after the removal, any multimedia devices on my computer just won't work anymore. Including my A4tECH Pk 635k Webcam cannot be installed. There are also yellow markings on the Audio Submenu of the Device Manager. When I opened the DX Diagnostics, it says that it doesn't have a sound card installed on my computer so I bought a USB Sound Card Adapater hoping the problem will be resolved, but it didn't worked either. There's an error message that the hardware isn't installed correctly. I need my webcam to be installed and use in Yahoo Messenger but the webcam has a built in microphone in it that's why, I think, it just can't be installed because of the sound card problem. Anyone please let me know what to do. Thanks.

If you are having trouble with your drivers
here is a general look at the drivers and how to update them
if your computer came with a motherboard disc the drivers could be on it
click start control panel administrive tools ,computer management ,device manager look through all of your devices if you see a yellow question mark?or exclamation mark ! or red x
right click to reinstall drivers or
if you can see your usb but its not working
ports(com&lpt)right click update driver
if your computer came with a motherboard disc the sound drivers could be on it
click start control panel administrive tools computer management device manager sound video and game controllers could be a yellow question mark? right click to re-install drivers
click start control panel sounds and audio,volume,advanced,speakers make sure you have selected the
(((appropriate speakers))) also audio you will find 3 drop down lists make sure you have the correct settings there
cnetdowload.com if these drivers are not suitable on the home page you should see the download software finder under that there will be a list platform, category sub category price from the category drop down list select drivers then from the price drop down list select free or which ever applies to your need
http://download.cnet.com/Realtek-AC-97-Driver-Windows-98-Me-2000-XP-2003/3000-2120_4-10238712.html

http://download.cnet.com/Realtek-High-Definition-Audio-Codec-Windows-Vista-Windows-7-32-bit/3000-2120_4-10788600.html

http://download.cnet.com/Realtek-High-Definition-Audio-Codec-Windows-Vista-Windows-7-32-bit/3000-2120_4-10788600.html

http://www.freeware-downloads.com/soundmax_integrated_digital_audio_driver_v.htm
SoundMax Integrated Digital Audio Driver v hope one of these helps