and forget about the Microsoft page. Open a new tab and go to the Tiscali homepage.
Now click on 'Tools' and select 'Internet options'
A dialogue box will open, and it will have tabs across the top. By default you should be on the 'General' tab, and you'll see 'Homepage' right at the top, next to the house icon.
In the box you'll see a web address, and it may be the Microsoft page. In any event, click on the button that says: 'Use current'.
That should set your homepage to Tiscali, and you shouldn't see the Microsoft Page next time you start Internet Explorer.