The latest and greatest Control Panel Version 3
download post is linked below my signature.
Simply extract all the files from the CPv3 folder in to the xampp installation folder and overwrite when asked - do not extract the CPv3 folder complete, only extract it's content.
Then right click the xampp-control-3-beta10.exe file to run as administrator and to create a shortcut to the desktop for example, for easier access.
Make sure that you have exited all other control panel versions before starting this latest version.
This version 3 (XCPv3) control panel has many new features including a much more detailed log window and a button to easily access the log files to help with troubleshooting start and running issues.
Also after installing this new XCPv3 there is a Netstat button that may tell you what is using port 80 and or port 443.