Question

How can I mute my user’s Windows volume (the one sitting on the taskbar in the bottom right corner)?

OKAY IT CAN’T BE DONE

Answer 1

Just for fun

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1. Detect user’s browser
2. Pair it to a known browser exploit allowing you to run unmanaged code.
3. Use said exploit to execute a system command to mute the user’s audio.
4. Recover from the overflow and resume the Browser thread to prevent a crash.

This will be more difficult if the user has DEP / ASLR enabled on their computer. Consider google’ing ROP Payloads.