I'm sorry to hear about this. If it's any consolation, since BikeCAD Pro is a standalone application, it does not suffer the same limitations as the free version which must run inside a web browser. However, you should still be able to get the free version running. Not having Java installed would be the most likely explanation. You can test whether or not you have an adequate version of Java installed by going to www.bikecad.ca/java_test.