Could just be a DNS issue with your ISP. I recommend using
OpenDNS, and see if it makes a difference.
If that doesn't work, something in your network stack might be hosed. To fix this do the following:
- Click Start, then RUN
- Type "CMD" (no quotes) and press Enter, and subsequently Enter after all the commands below, too.
- Type (no quotes) "netsh int ip reset all c:/ipreset.log"
- Type (no quotes) "netsh winsock reset catalog all"
- Type (no quotes) "ipconfig /flushdns"
- Type (no quotes) "ipconfig /release"
- Type (no quotes) "ipconfig /renew"
- Type (no quotes) "exit"
Restart the computer and try again.