Do you have any other internet enabled applications that are connecting properly? If you do have other internet enabled apps and they too are having problems than I would suggest trouble shooting your network connections.
If you are running Windows XP go "Control Panel" and under "PIck a Category" select "Network and Internet Connections". Next select "Network Connections". Right click your network connection and select "Repair". Windows will attempt to repair your network drivers, settings, and reestablish your network connection. If unsuccessful it will attempt provide an error message describing the problem.
If you don't see that option start checking connections along your network cable wiring. A plug may have come out or a cable damaged.
If it is not your network connection or your wiring it is your browser software. Reset your browser back to default settings to repair any changes made by accident by yourself or perhaps a website attempting a browser hijack:
Reset Internet Explorer to the default settings
To reset Internet Explorer to the default settings
- Close any Internet Explorer or Windows Explorer windows that
are currently open.
- Open Internet Explorer.
- Click the Tools button, and then click Internet Options.
- Click the Advanced tab, and then click Reset.
- Select the Delete personal settings check box if you would like to
remove browsing history, search providers, Accelerators, home pages, and
InPrivate Filtering data.
- In the Reset Internet Explorer Settings dialog box, click
- When Internet Explorer finishes restoring the settings, click Close,
and then click OK.
- Close Internet Explorer.
Your changes will take effect the next time you open Internet
Hope this helped.