Suddenly my microphone is only working intermitantly and when I play back voice recorded on the mic I get a really lound screetching noise and can just about hear my voice in the background. Any suggestions would be appreciated as I don't know wheer to start. This may be a coincidence but I just installed service back 3 Windows XP.

Have a read here.
http://www.pcadvisor.co.uk/forums/in...6169&forumid=1

I'm already using a headset. Also the noise is only on the mic playback.

My PC is now crashing all the time and I can no longer open control panel.