registration link doesn't work

I just installed the new 7. 0.1426.
I doesn’t do anything when I try to scan. Blank window.
I tried to register, blank page.
I did get an email for comfirmation, but that page draws an “unknown” message.

Have you rebooted since you installed it ?
If not it is a requirement.

If you have rebooted - Have (or did) you another Anti-Virus installed in this system, if so what was it and how did you get rid of it ?