Internet lose voice

Hi, Any expert can give me some suggestions ? I am using PC with Windows 7. I suddenly found my internet lose voice. and CNN and CBS web sites etc lose voice when I watch its video. And my mp3 players in my PC can not emit any sound no matter what kind of players I use. One of the mp3 player is Windows Media Player. The sound signal can be seen on its control panel when I run the mp3 file with mp3 players. I confirmed the speaker is good and it can speak, but it can not have any voice when i played the mp3 file with Windows Media Player or other MP3 players in my PC. Thank you.
EESkyAsked:
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aadihCommented:
If it worked yesterday, then do a system restore by booting up in safe mode with command prompt and typing rstrui.exe to restore your PC to a time before the sound problem occurred. It'll take only a few minutes, and if it works, it's the easiest and quickest solution. Try it.
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aadihCommented:
What codecs have you installed?

Install K-Lite Codec Pack (basic) and see if fixes the problem.

http://codecguide.com/download_k-lite_codec_pack_basic.htm >
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EESkyAuthor Commented:
Thank you for your fast reply. I do not know what codecs that PC installed.
What is happening with my PC ? Yesterday it worked well and had voice. Today it lose voice of internet.
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EESkyAuthor Commented:
Hi, Thank you so much. It works out.

When i tried to do that, i just found only one time point that i could choose. so it is successful.

I did this kind of thing months ago, but the problem was that there was no time point for me to choose to restore it. Can i set the Windows system which can automatically set time point once a day ? Thank you
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aadihCommented:
You could create a system restore point every 2-3 days (or a week) (or after installing a bunch of programs) manually. That's how I do it, just to be sure always.
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