This tweak quickly completes website address in Internet Explorer by adding the www. prefix and the .com suffix
1. Type the main name of the website. eg. "windowsxpatoz"
2. Press CTRL + Enter
3. IE completes the address to "www.windowsxpatoz.com" and starts going to the site.
Works on all newer versions of Internet Explorer.
Only completes for www. and .com - not for countries such as .co.uk or .com.au
Make sure that "Use autocomplete" is enabled in Internet Options > Advanced, otherwise this will not work.