Norton Online Backup not working

I've recently started using Norton Online Backup (5GB) but it doesn't seem to be working correctly.

 

After adding my PC, I performed a test backup on an empty folder on my desktop. The backup doesn't start at all, and freezes on "Files scanned: 0 (0 bytes)".

 

I have tried removing the PC and retrying, to no avail.

 

PC info:

 

HP Pavilion dv6

Windows 7 (64-bit)

Browser(s): Firefox 4 (beta) and IE8

 

Any help would be appreciated.

 

EDIT: It has now decided to communicate. Thanks anyway.