I want to disable the viewing of sales records from my employees. I can successfully disable certain manual options by using the below "admin profile" addon.

http://www.zen-cart.com/index.php?main_page=product_contrib_info&products_id=86

However, there is a loophole. When user click the "admin home" link around the top right hand corner, they can see a summary of my sale figures. Is there anyway to disable this link in the admin panel? Or simply disable the summary page?

Can any expert help?

Certainly, the extra code that you would need to insert can be found in the Admin Profiles support thread.

I found the following information about how to disable the "admin home page". However, I'm not familiar of php stuff. I think I will not be able to do it myself. Does anyone had developed a version base on zen-cart 1.3.8? Or simply send me the exact code and the location needed to be replaced?

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What appears on the Admin Home page is controlled by the admin/index.php file. There's not a switchable way, though you could use CSS to set display:none for the class .reportBox. This would turn the home page content off for all users. If you wanted more precision you would need to change the PHP by inserting "if" statement in there to restrict display to specific values of $_SESSION['admin_id'].

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I don't have a current version of the file with that information in, but the step-by-step guide for building one is very clear. You can find it here.