Website not working in internet explorer but with firefox?? And Webmaster tools prob.

I just found a major problem. For the past few weeks I have been opening up my webpage in firefox and its fine. It has been ranking really poorly and I dont know why. I opened it up in internet explorer and the page doesnt open up?? The website is Y

• internet explorer
• webmaster tools

Should I Sign Up for a Google Webmaster Tools Account?

Why should I do this, and how do I sign up?

• sitemap
• webmaster tools

Why is Google's Index Showing 404 Errors on Several Pages of my WPD site?

If you do a Google search for your site and see 404 errors on the results or when you click on any of the links, please read this.

• 404
• Google
• sitemap
• webmaster tools