I should also note that Excel 2007 is outdated and unsupported now, so upgrading is recommended. If they're using it on newer OSes, there might be compatibility issues.
First, steps to activate Excel 2007 if the activation isn't working. Common issues include incorrect product key, time zone issues, or corrupted activation servers. I'll need to outline methods like using the Microsoft Activation Wizard, changing time/timezone, using command line tools. Also, if the product key is invalid, they need to re-enter it correctly. excel fix 5.95 activation code
Another angle: maybe they're referring to an activation code for an add-in or a specific tool that uses 5.95 as part of its name? Not sure. But given the context, Excel 2007 activation is the most likely scenario. I should also note that Excel 2007 is