Avast fails to update

Avast Free Antivirus / Premium Security
1

The avast interface claims that the system is fully secured but
auto updates don’t occur and the update link doesn’t connect.
How can I restore functionality?

program version 7.0.1474
definitions 1121217-0
xp pro
real time shields ON
definition auto update ON
expiry 3/20/2013

2

Is there any other security installed that might be interfering ?

You can also run a repair of avast via uninstall programs to see if that helps.