Convert Excel VBA Application to Excel Add-In for Excel 2007

I wrote a Excel Scatter Chart program in Excel 2003 VBA that I need converted to a Excel Add-in that can be run as either a button in a menu or a menu item in Excel 2007 & Excel 2010. I average Office user will need to be able to install and add to menu (button or menu item) easily. Background I wrote a Scatter Chart program in VBA in the mid 1990s and converted it to an Excel add-in that others in my company and a few colleagues used in our analysis. The VBA application uses forms to collect info from the user on the XY Scatter Chart (X range, Y range and label range). The reason I had to build it was because you can not add a separate set of labels to the values of a XY Scatter Chart in Excel unless you do it manually. The application also allows the user to easily update existing scatters with a new data point and new label. It has worked fine until Excel 2007. I am assuming it is a combined problem of a tougher security model and the shift to Ribbon menus, but frankly I do not have the time and my tech skills have been neglected, to figure out the fix. I have the spreadsheet and when I run the application from the spreadsheet XLS it works fine. It is the XLA that I can not run the way I used to run because I can’t see it and can no longer call the program from a menu button. Before, I would have people drop the XLA on their hard drive. Copy down the path to the file. When in Excel they would add a Macro Button (I prefer smiley face) to a menu bar and assign the button to run the application. Example 'C:\temp\programs\excel\scat\[login to view URL]'!Goscat