Hello Xaria. You might be making things more complicated than need be with the overall server configuration. I refer to:
Xaria wrote:... I edited the apache httpd.conf file ...
That might cause issues with functions of the web server than you don't want to touch or even realise you're affecting.
Please have a look at "virtual hosts", ie search these forums for "virtual hosts" or try http://httpd.apache.org/
Note that the main httpd.conf file points to the configuration at C:\xampp\apache\conf\extra. Take a look inside httpd-vhosts.conf.
Oh, and backup before any changes are made.... of course.
How about restoring the original vhosts.conf file and then playing with httpd-vhosts.conf?
Regarding access from the LAN, please confirm how you're actually trying to do so. For example, do you type http://192.168.0.103
in a web browsers address bar? I assume that 192.168.0.103.
And as Nobbie says, we don't know what you've tried, let alone what's succeeded or failed,,, let alone what's changed.