PEAR install help

I see some references to this on the web but I can not find a specifically what the fix is - please, I need to know specifically what I do to fix it. I'm using win2k. Here's the error message I get when I try go-pear.bat, I upgraded from PHP4 to 5, seems to all work except for PEAR: Unknown(): (null): Unable to initialize module Module compiled with module API=20040412, debug=0, thread-safety=1 PHP compiled with module API=20020429, debug=0, thread-safety=1 These options need to match Edit/Delete Message