Click the sound icon in your system tray and drag the slider up to 500%.
Here are some legitimate and completely free sound boosters for Windows: Free Product Key For Letasoft Sound Booster
Increase volume significantly beyond the max. Click the sound icon in your system tray
Formerly a paid software, FXSound is now entirely free for everyone. or ransomware System Stability
Searching for "free keys" or "cracks" exposes your computer to several dangers: Malware and Viruses : Files from unofficial sites often contain keyloggers, adware, or ransomware System Stability