Thorough removal of sound drivers (including flash) for re-installation - as flash is broken

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http://askubuntu.com – Question in short: How can I do a thorough removal of both Pulseaudio and ALSA drivers as well as flashplayer? My flash no longer works after switching from Pulseaudio to ALSA. I tried removing re-installing flash from different sources such as the .sh from Adobe, the flashplayer-installer from apt, and from Software center. Background: Had terrible noise from my speakers using the default ubuntu 11.10 sound driver so I tried to switch to ALSA from Pulseaudio (using the Creative XtremeGamer card), after changing to ALSA - there was absolutely no noise at all - perfect quality, but no flash. (HowTos)