to flush your DNS
XP And Below:
1.) Go to start->run.
2.) Type in "cmd" without the quotes.
3.) At the command prompt type "ipconfig /flushdns" again without quotes.
Vista:
1.) Click on start->All Programs->Accessories
2.) Right click on the command prompt and pick run as administrator.
3.) At the command prompt type "ipconfig /flushdns" no quotes.
This will flush your DNS and will solve a lot of issues with your computer caching the wrong information.
-Corey