Accessing Includes files

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Hello there everyone, just wantd to say thank you to everyone who has posted advice and fixes for working out the installation blues, I was up and going in no time. However, I have hit my next wall. I am running the site locally on my computer with Apache. I am able to see the catalog, enter new products etc. However, I want to customize the site more, eg, putting my logo in the header instead of the oscommerce header. When I try to access things such as application_top or application_bottom or footer from the /catalog/admin directory I get warning and fatal report messages that I am missing a line of code (different line # depending on what I'm trying to open) the error usually tells me that I'm missing   //include_path='.;c:\php4\pear// or something to this effect and I need to add it to line 13 or line 29 or whatever in the appropriate file in my admin/includes directory. When I check the server settings from the GUI on the admin page, it shows the the 
php4\pear script is enabled. What do I do?

Please Help,
Fibonacci