you know, that there is a special XAMPP for Windows Board here in English?
Returning to your question:
It should not be a problem to install XAMPP, even if "your" Port is already taken. You only will get a problem when starting the Apache Webserver.
In this case you either have to modify the configuration file of the Apache (called httpd.conf) or you have to modify / uninstall / disable the other Program, using this Port.