Now that tells me a lot and my educated guess is that your Antivirus software or Internet Security software is not allowing PayWindow to open the links on our website since you can do it manually by navigating to our website but not from within PayWindow.
You will need to figure out how to add PayWindow to any of those programs as a trusted application. This happens generally when you go to do something like you need to do and the AV pops up and out of habit you click to block.
Paul Mayer
ZPAY Payroll Systems, Inc.