You haven't said which web site, so we can't check, but it can either be your ISP blocking a range of IP addresses of which your site is one, or your own security settings, and/or anti-spyware utilities.
Check your Hosts file, (Windows/System32/Drivers/ETC) and open your Hosts, (no extension), with Notepad, and see if the web site or it's IP address is listed there. If so, is the IP address being re-directed to Localhost? Your web browser always checks Hosts first before searching the internet for a web site and if it finds an entry there it will go where the entry tells it.
Some anti-spyware utilites will also block certain sites if they are listed in the anti-spyware's database of blocked sites.
But if none of that applies, then perhaps a phone call to your ISP will find out.
I cannot go to a particular web site via IE. It happened all of a sudden. I had the following message :
The page cannot be displayed
The page you are looking for is currently unavailable. The Web site might be experiencing technical difficulties, or you may need to adjust your browser settings. ............................................
"Cannot find server or DNS Error
But when I use someone computer, they can able to see the web site. Why ?? I am using cable connection. Is it possible that they block my IP address. Or something to do with my security settings in IE??
Please help !!