how do i change the mtu settings on my computer so i can receive safe sites. e.g. microsoft, msn.?

Answer 1

Your mtu settings has nothing to do with opening sites like microsoft or msn.
here's a link to tell you exactly how to change your settings if you still wish to http://support.microsoft.com/kb/826159

Answer 2

several search engines have safe search forms you can use. but none of them are 100% reliable. you will still get a little porn.

http://www.google.com/search?&q=safe%2Bsearch