How do u block myspace off our home computer?

How do u block myspace off home computer

You can use the hosts file:
The Hosts File and what it can do for you

Edit to add: Look a site that wants to do exactly what you want :)
Block MySpace.com on Windows: zero cost, no additional software | Exodus Development

If you use Internet Explorer, you can also enable to Content Advisor (Click tools, internet options, content, and enable it there). Then you can go to 'Approved Sites' and add Myspace as 'Never' approved.