Checkout Payment Page is Blank
This is because Windows XP Service Pack 2 and 3 do not support 256 bit SSL encryption which is required to encrypt the information on the checkout / payment page (to protect user data).
To resolve this issue you will upgrade to service pack 3: http://windows.microsoft.com/en-us/windows/help/learn-how-to-install-windows-xp-service-pack-3-sp3
If updating Windows XP Service Pack is not an option, you can also complete the registration using your smartphone or tablet.
Please contact athletechs Customer Care if this does not resolve the issue.