There is an in-game menu to turn up the sound try making sure that you have the setting correct there, you can find this under the spanner icon, then clicking the microphone icon.
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you need to reload or update your internet broswer
as long as your java is of a new version, runescape should work fine.
If you have completed the quest you cannot get another.
No, because the bots use there own RuneScape client...
Runescape may not load in your computer for many reasons. However, the most common reason is because your computer does not meet all of the requirements to run the program, or if your computer is not connected to the internet. Follow the related link to try and resolve your problem if you have one still.