Welcome Carl.
Doubleclick.net is an Advertising and Marketing group used by thousands of sites to promote there products.
When you visit one of these sites they sometimes plant a doubleclick Cookie on your system.

Have you tried clearing your cookies to see if the problem goes away?
I would recommend you delete your cookies manually by going to your C:\Documents and Settings\~yourname~\Cookies folder, rather than using the clear option via Internet Options.Also clear your history folder.
You can also prevent Automatic Updates from trying to connect by disabling them.
Right click My Computer,select properties and on the Automatic Updates tab enable "Turn off Automatic Updating".

Apologies if i've suggested things you have already tried.