Internet explorer not displaying

Hello,
I have a toshiba and use vista...my wireless was working just fine earlier today. when it stopped I turned it off and it continued to not work. i ran a diagnosic on it, vista said there were no problems. I ran a repair and it said nothing was wrong. When I try to connect to my homepage, the first thing that comes up is navigation is cancelled then the internet explorer can not display page pops up. I am really curious what is going on. I have two computers and the one I am currently on is successfully working. The other refuses to do. I do not know what to do...would appreciate any advice or help.

Thank you.