Problem inputting serial number

I have tried numerus times to install solid works but every time I get to the input serial number page I am unable to continue.

If I hover my mouse over the continue button the cursor changes but If I click nothing happens. Its the same case for the cancel, and back button.

The only button that does work Is the the x button to close it all down.

Any Ideas??

Thankyou, Ben

SolidworksAdministration