Basically this is a bit technical, but the installation is kinda complicated and those online help does not really help, so I am going to do my guide here.
Open Conference System is a open source software that can be used to manage conference which includes user registration, paper submissions and many more features. It can be downloaded at http://pkp.sfu.ca/?q=ocs
If you read the manual it says it requires Apache, Php, MySQL. The easiest way is to a software called XAMPP which contains these three things.
Once you download the Open Conference software you have to unzip it and put it in the XAMPP/htdocs folder.
One thing that they did not tell you is you must manually create several folders
1. cache - inside cache you create the subfolders _db, t_cache and t_compile
If you did not create these folders, you will face problem installing, err, how do you actually install??
You just type localhost/software and follow the instructions.
One common area is the database error, it will say access denied or something like that.
The most common mistake is getting your User wrong. Check it at the MySQL console.
If you done everything correctly, you should be able to install it correctly