Acess to Program Files on network drive

On the computers drive you are trying to access have you checked your permissions on the Program Files Folder?  You may need to change the permissions and make sure you are in a group with permissions to access the folder and all subdirectories and files.  You can do this by clicking advanced in the security tab and checkmarking the box that applies the permissions to all subdirectories and files.  

Also you may check the firewall on that machine as well and make sure its not blocking the connection.

I have checked and it says that I have permission to access the entire drive.  I have access to many of the folders but not the Program Files Folder.  The firewall gives me access to the machine and I have tried turning the firewall off with no change in the result.

Check permissions under the 'Advanced' button of the security tab. The folder in question may not be inheriting permissions.

Just because you have permissions for the entire drive doesn't mean that folders within the drive have the same permissions.  Like I posted above go check the advanced permissions of the program Files folder itself not the drive permissions.  You may need to apply a permission to yourself in here and checkmark the box to replace permissions on all subfolders and subdirectories.  

Good Luck HTH.

If I open windows explorer, right click on the Program Files, select Sharing & Security it tells me that "All the options on this tab are disabled because this folder is used by the operating system"  On another computer on the LAN I have access to the Program Files and when I try the same procedure it also shows the same message.
I know I am missing something but I don't know what.

Like I said you need to go into the advanced button in the security tab.  You are just checking under the sharing tab.  Click security at the top.  Then click advanced towards the bottom right.  Then add your user to the list with the proper permissions then click ok.  Then Checkmark the box next to replace permission entries on all child objects...  Then click apply and when it finishes ok.  Then you should have access.

How do I get to the security tab?  I can't find it.

OK I take it you're running this on a Windows XP Home edition tower.  The problem is with XP Home Simple File Sharing restricts sharing of the Program Files folder and it is not accessible.  You can go within program files and individually share the folders that you need to access by right clicking on them going to sharing and security and sharing the folder.  There is not another good way that is 100% reliable to share the program files folder.  There are a couple of ways to do it but there is a risk.  Here is a link to a page where an MS MVP gave some advice on this but heed his warnings and make sure you take the proper precautions before messing with the file system.  
http://www.pcreview.co.uk/forums/thread-235248.php
Good Luck HTH.

Thanks.  In looking it appears that the computer that I have full access to is FAT32 and the one I am having trouble getting at is NTFS.