Notuo, It's a case of 'you can't start more than one version of XAMPP at the same time'.
Try this:Very Important:
First make sure that all XAMPP components are stopped and any of the components installed as an NT service are uninstalled first - to be sure that the services are uninstalled run the C:\xampp\apache\apache_uninstalservice.bat
and the C:\xampp\mysql\mysql_uninstallservice.bat
files before renaming your old version of XAMPP and use the corresponding bat files in your new version folder of xampp to remove any components running as an NT service.
Restart your PC and check using the Windows Task Manager
that no apache or mysql files are running processes,
(right click on the Task Bar and select Task Manager then click on the processes tab
1. Rename your old XAMPP folder C:\xamppold
2. Run C:\xamppold\setup_xampp.bat
file to set the renamed paths correctly.
3. Now rename your new XAMPP folder C:\xampp
4. In this new version, which you will be running from now on, run the C:\xampp\setup_xampp.bat
You should now be able to manually start and stop the old xampp version by running the C:\xamppold\xampp-control.exe
(create a shortcut for it on your desktop and name it Old Xampp
You should also be able to start and stop the new version of XAMPP by running the C:\xampp\xampp-control.exe
(create a shortcut for it on your desktop and name this one New XAMPP
Now you should be able to have the best of both worlds, but remember only one version of XAMPP can be started at any time.
Also worth pointing out here is that your old MySQL databases are stored complete in the C:\xamppold\mysql\data
folder with each having it's own database name as a folder, only need to copy over to your new XAMPP C:\xampp\mysql\data
folder your own databases not any XAMPP system databases like cdcol, mysql,phpmyadmin etc.
After coping the databases, if that's your method now, then run the New XAMPP version's phpMyAdmin
and see if the databases are present in the left column and if all is working as it should then you can delete your old XAMPP installation and simply use the new version from now on.
To save you having this hassle in future try and keep up with the XAMPP upgrades as it makes this process much simpler and much quicker - For the latest version notices, ApacheFriends is now on Twitter:http://twitter.com/apachefriends
RSS feed of ApacheFriends's tweets:http://twitter.com/statuses/user_timeline/8356022.rss
I hope this helps as I have many XAMPP version installed and can select which version I need to start by simply selecting that version's Shortcut, mainly for troubleshooting issues on this forum.