I have uploaded all the files to my root directory. I have chmodded them all to 755 and done all that I am aware I have to do. What is the url I should point my browser to in order to get a hold of the installation screen? Thanks for your time and cooperation.
If you have uploaded all of the files to the root directory, then you should just be able to navigate to your site and the set up screen should be visible.
A couple of things, as CC3381 states, you must have a database set up for C5 to install correctly, finally, assuming you uploaded the files via an ftp program, did you ensure there were no failed transfers?
Who is you web host? Some hosts require special attention, some of which can be found within the link that CC3381 kindly posted.
Who does your clients friend use for hosting? Most web hosts will have the ability to perform a one click install. The automatic install will take care of the installation for you. Perhaps this would be an easier path for you to take.