A - uhh - "C:\xampp\htdocs\cw4\cwapp\appcfc\cw-app-onrequeststart.php on line 37"
cw4 - has got zero to do with XAMPP, so you must have had things running at some point. and those errors are specific to that script, you should probably check and see if it works correctly with PHP 5.4.x -- They will be the only ones able to help you effectively with that,
B. CP - run as administrator - OK - When you go to start the XAMPP Control Panel - right click and use the option 'Run as Administrator'
C. You can always just type http://localhost/phpmyadmin
in your browser to start phpMyAdmin
I recommend you DL and install the latest Control Panel, its found in this thread -viewtopic.php?f=16&t=48932
You might also consider updating your profile to make it simpler to answer questions