Question about apache

Hello guys i have a question about apache... i have installed Apache 2.0.54 PHP 5 MySQL 4.01 and i was wondering if i could use a name to access my apache server -> not to use http://localhost but to use example1.com? i have tried to adjust the vhost section acording to the guide in the apache web page, but when i try i get error 404. also when i try http://localhost i also get 404. i've attached my .conf file.
i want to access my server not only from my local network but from elsewhere as well.
i have one more small problem... when i installed and loaded some moduls for PHP /i have loaded 5 modules/ 2 of the moduls doesnt seem to work ->php_mcrypt.dll, php_pdf.dll. The first one is in the directory for /php/ext/ for shure, but the otherone is not on my comp... i was wondering if one is missing, ok, but the other i there and i get "PHP Startup: Unable to load dynamic library "f:\apache\php\ext\php_mcrypt.dll" - The specified modul could not be found." - this is for the both modules...
should i install Apache 1.3.x?
any suggestions to a newb
thx in advance
ps. i've read some of the topics but i couldent find a solution ...

and here are my comp conf:
WindowsXP Pro SP2, CPU 400MHz
Internet over LAN, using PPPoE connection
2 comps in local network
one more thing i've changed my ip for the vhost to 212.116.140.79, and now whe i type that ip it shows me something like windows explorer...

Have you purchased the domain?
If so, then you may need to pay a dynamic name server to direct the domain to your local box.

Does your apache work if you use http://your-ip-address/ ?

yes it works. i see the test page from the other computers on the net, when i type 212.116.140.79 /my PPPoE ip/ i get :

this is when i created a folder for amidamaro.com,
no i didnt purchased the domain

my question is : i have an apache server, i want to assign a name adress to it /for examp amidamaro.com/, other users, not only user from my local net to be able to access it. is there some guide how to do that?

now i've set up the server to ip http://212.116.140.79 u should be able to see it. there r some pics