You can override any homepage setting in Internet Options. If you have Spyware, or come across it frequently, then this is a very good tweak for you.
Right-click on the Internet Explorer icon on your desktop and select "Properties".
Now in the "Target" box you will see "C:\Program Files\Internet Explorer\IEXPLORE.EXE".
Now by adding the URL of the site to the end of this it overrides any Homepage setting in internet options, see example below:
"C:\Program Files\Internet Explorer\IEXPLORE.EXE"
www.google.com
This will stop websites re-directing you automatically.