I just installed Mathcad and have never used this program. When I enter a simple equation into Mathcad I get a message "Library Not Registered" -- what do I need to do?
Make sure you have the prerequisites installed. In particular note that the different versions of .NET can coexist, and newer versions do not supercede older versions. You must have the required version installed, a newer version does not work. Run a repair on the installation. For reasons unkown it is not uncommon for files not to be properly registered during the original install.