N Force Audio Drivers Causing Slow Down / Freezing

I found recently (since last reinstall) that my mic input was not working. I figured it might be that the mic input was being used for 5.1, but not being able to find this option in windows anywhere remembered that the NVmixer had loads of options to change all this. So i dug out the old driver cd, installed the nForce2 audio drivers and programs and restart.Since then when my pc starts up it either freezes (starting with open apps, then single beep and total freeze), or slows right down to the point where task manager will take 2-4mins to open on three fingering.