Inability to connect to the server from another machine after switching off the localhost firewall tells us that there is another firewall somewhere! You don’t provide details about your network and where the test clients are located – on the LAN or on the Internet.

So, let us know is your server on the same LAN with the client(s), or the server is a home PC connected through a router/gate to an ISP and you trying to access it from a client(s) on the Internet – in the latter case you have to configure port forwarding through the gate AND to arrange a static IP with your ISP, and then continue testing…

Petko
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Also, you will need to register your domain on a DNS server, in order to make it accessible through the domain name.

In the error log i have this-
Server built: Sep 9 2011 10:26:10
[Wed Oct 26 09:41:52 2011] [notice] Parent: Created child process 3272
[Wed Oct 26 09:41:53 2011] [notice] Child 3272: Child process is running
[Wed Oct 26 09:41:53 2011] [notice] Child 1732: Released the start mutex
[Wed Oct 26 09:41:53 2011] [notice] Child 3272: Acquired the start mutex.
[Wed Oct 26 09:41:53 2011] [notice] Child 3272: Starting 64 worker threads.
[Wed Oct 26 09:41:53 2011] [notice] Child 3272: Starting thread to listen on port 80.
[Wed Oct 26 09:41:54 2011] [notice] Child 1732: All worker threads have exited.
[Wed Oct 26 09:41:54 2011] [notice] Child 1732: Child process is exiting

That’s why it is important to provide enough details. I thought you were getting errors when configuring your apache server because of this part of your question: “…is in use by another program”

Please, keep in mind that we don’t know your set up nor do we know what you are trying to do or how you are trying to do it, so we need you to provide all the necessary details to help you troubleshoot the issue.

Gabe9527 suggested turning the firewall off. That would be the first thing to try. If that doesn’t work, then answering the following question would be a good idea (please be specific):

“But according to my windows Firewall it is used by another process”
How (and when) exactly is the firewall telling you that the port is used by “another” process ?

“I can view the website made by me in my own computer…”
How are you viewing it ?

“…but i can’t view it from another computer.”
Are you talking about another computer on the same network ?
How are you trying to view it ? (what is the URL you are trying ?)

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P.s. I have removed Harisheldon1960′s answer from the Wiki, since it was incorrect and misleading.

Then add a rule to allow Port 80 access.
http://www.windowsecurity.com/articles/customizing-Windows-Firewall.html

Also, you don’t “configure” your browser to use a specific [remote] port. If you want it to connect to a different port, you just have to specify it in the URL.

The local port used by internet browsers is transparent for the user. It is assigned by the OS and it doesn’t not interfere with the standard ports used for services such as http, ftp, etc.

If you are getting errors saying that the port is already in use, then you need to look for another web server running on your machine, which most likely would be IIS.

If that is the case you could completely remove IIS (control panel -> Add/remove programs ->Add/remove windows components) or stop it (control panel -> Administrative Tools ->Services)

If IIS is not running, you could use TCPView to identify the process that has port 80 in use. It is a Sysinternals tool that will show information about TCP and UDP endpoints on your machine.