Here is what I have done so far. Java and Adobe Flash are both up to date. "Play Sound on Webpages" is enabled on my explorer. I have the latest version of Explorer. I even made sure that Java scripting is enabled. NOTHING HAS WORKED! This started about a month and a half ago but when I restarted my computer it started working again. Now for about the last 3 weeks I haven't been able to get any sound from the internet. My sound works fine on my music and videos I have on my comp. Anything on the web though isn't working. What else can I do?

Bump

What browser are you using? If it's Firefox you can try this:
Flash-based videos and sound do not play correctly | Troubleshooting | Firefox Help (http://support.mozilla.com/en-US/kb/Flash-based%20videos%20and%20sound%20do%20not%20play%20c orrectly)

This guy seems to cover all the bases:
Codec Guide: 10 fixes for sound problems in Flash videos (http://www.codecguide.com/fix_for_flash_sound_problems.htm)

I'm using internet explorer

Well it's worth installing Firefox and its Flash plugin. That might be your solution.