Try to go through these basics...
Turn off computer. Disconnect router, and modem from power source for 30 seconds.
Power them back on.
Restart computer.
If that doesn't work, bypass router, and connect computer straight to the modem.
If that doesn't work...
Go Start>Run (
Start search in Vista), type in:
cmdClick OK (in Vista, while holding CTRL, and SHIFT, press Enter).
In
Command Prompt window, type in following commands, and hit
Enter after each one:
ipconfig /flushdns
ipconfig /registerdns
ipconfig /release
ipconfig /renewRestart computer.
If that doesn't work...
Go Start>Run (
Start search in Vista), type in:
cmdClick OK (in Vista, while holding CTRL, and SHIFT, press Enter).
At
Command Prompt, type in:
netsh int ip reset reset.logHit Enter.
Type in:
netsh winsock reset catalogHit Enter.
Restart computer.
If that doesn't work...
Download, install, and run
WinSockFix:
http://www.softpedia...inSockFix.shtmlRestart computer, and check again.
If that doesn't work...
Download
Dial-A-Fix (DAF):
http://wiki.lunarsof...2C_and_articlesHave XP CD available in case DAF needs a file. Likely not!
Check all boxes on the screen (clear any restrictions if it shows any)
Then click GO!
When the entire page is finished click the
HammerHead at bottom to go to the second DAF page.
Here,
one at a time, do the below:
Reinstall BITS
Reinstall Windows Firewall
Repair Permissions
Reset networking
Watch for any File not found or other errors and make note as this may lead to the fix!Restart computer.