CP4 Microphone audio saturating/overdriving/clipping my recording

I've been using CP4 for over 1.5 years.  Using xp professional on work pc and Vista on home PC.
When I record audio it has always automatically ajusted my volume when setting the microphone level. I then record and playback/edit.  Sometime I insert audio into the original recording - no problems.
2 days ago I tried recording.  The audio was overdriving and distorting the recorded audio wave file.  When I looked at my microphone audio settings via Contro panel>audio settings -  it was pegged at maximum
No matter how softly I speak, it overdrives and clipps the recorded audio file.  If I try and insert additional audio into a previous recording, It completly saturates the wave.
I try the same thing on my personnel PC with CP4 and everything works fine.  I can import audio that I record on my personnel pc back to my work pc, and it imports and plays just  fine, but if I try to re-edit and insert additional audio into it - completly saturates the audio recording file.
Questions: What happened to cause this?
If I record in Adobe presenter or Soundbooth on the work pc, everything works OK.
Somehow the CP4 audio recordings are getting screwed up.
Should I reinstall the SW?  Haven't tried that yet, but need some help.
I went back to figure out what SW i had loaded since the last project.  I loaded Skype and it worked fine.  I also enabled my webcam and it worked fine.  I also added skype to my Vista pc and everything worked fine.  I re-recorded CP4 audio after installing the webcam and skype on my vista pc and it worked fine.
I uninstalled skype on my work pc, it did not fix problem.  Outside of un-installing CP4 and re-installing can anyone give me advice?
Thanks:
Thanks
John

Interesting....... as always.

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