By mistake I hit the restore default on Soundblaster Live 5.1 and now I have no audio. Is there a way to reverse this easily? I need help on this.

Try going into your control panel -> multimedia -> click 'advanced properties' under playback.

Change your speaker setup to the one you have. Might do the trick if you're running something other than 2-speakers.

Also, make sure your volume is correct in windows and not (for some reason) on mute.

Thanks. Actually, I got it back (somehow) when I ran the Creative diagnostics page. Everything seems to have returned, but I am not sure how I did it.