I am in your store.
I know what happend there.
Magento 1.4.1 dont permit Extensions in the menu.
We should upgrade our extensions.
You can see that the extensions are installed.
Please go to Sistem – Configuration and you will see “Hellothemes – HelloChat”
Also, if you go to Advanced you will see that Hellothemes and Hellochat are enable.
We should solve this soon.
Have a nice weekend.