Never allow any one to change the home page..

1. Right-click on the Internet Explorer icon on your desktop and select "Properties".

2. In the "Target" box you will see "C:\Program Files\Internet Explorer\IEXPLORE.EXE".

3. Now by adding the URL of the site at the end of this it overrides any Homepage setting in internet options:
for eg:
"C:\Program Files\Internet Explorer\IEXPLORE.EXE" www.shareordie.com