Hi warshark (there is ALWAYS time for a short salutation, especially if you are asking for help on a community board. It's a matter of politeness),
warshark wrote:httpd.exe: Syntax error on line 69 of C:/xampp/apache/conf/httpd.conf: Cannot load C:/xampp/apache/modules/mod_authn_default.so into server: The specified module could not be found) i need help.
Because the module line is not present in the current apache httpd.conf a assume you have copied over the configuration files from an older installation.
Simple answer: This will get you in much more trouble than this simple message. Many modules have changed!
If you are unsure which changes have to be done start with the default httpd.conf from a fresh XAMPP 1.8.0 installation and just do the changes needed to be done for the functionality of your application.
if you are familiar with the Apache configuration parameters merge your old configuration with the new one just copying this values which are still recommend and valid with Apache 2.4.
Please be aware that we don't support any copy over installations because the issues resulting from this can be very difficult to debug.