I am the only user so far who can see share point page at this time. Have also checked user permissions, anonymous access, and also through group access and all looks right. Can you suggest the reason behind this problem as no one except me is able to look at the site and for others its saying Error : "can't access this page".
When you say "can't access this page" do you mean they get prompted for credentials and can't get in when providing them?
Is it a .NET error message, a SharePoint error message or a browser error message? Is that error copied and pasted exactly?
What rights are the users who can't get in supposed to have? anonymous only? contribute? Can they get into _layouts/settings if they go in to that url directly?