Yes, there is a version that will run on a 64bit computer, but you will have to buy it since the one you have is obsolete and doesn't provide compatibility with newer operating systems. I checked the websites, and established that you can try the following product: http://www.pryor.com/mkt_info/products/microsoft-excel-formulas-2010.asp
It's supported on newer operating systems, but before buying, make sure to contact the seller and ask him directly about 64bit compatibility. This avoids many issues in case there is a chance for missing 64bit support.
Use the toll-free number to call them. It's on the lower-left section on the website.