2)Changing MTU values
How To Change MTU Values In Windows
Sometimes you may face problems connecting to the internet where certain websites may not load and others may..Like for example google.com might work but yahoo.com may not.Then the first thing which you would try to do is change your DNS servers ( mostly opendns :D thats what everybody tells you to do) .So you go ahead with their advice and change your DNS servers to opendns.Then reboot your pc and oops..what happened? Nothing???If nothing happened, then dont worry you can try one more thing, and that is changing your MTU values.
MTU meaning Maximum Transmision Unit is basically the size of the packet that is transmitted.Sometimes in certain cases default MTU values may not work depending on your network setup you might have an incompatible MTU configuration.So what you could do then is modify your MTU values.By default Windows uses 1500.Sometimes you may have to lower it down to say 1492 or 1454 to get things working!!
I would recommend you to first try 1492 , if that doesnt work you could try these other values like 1454,1460,1452 .
So here's how you do it in Windows
Step 1 : Go to Start-> Run ( or press the windows symbol on the keyboard + R) and then type regedit.exe in the popup window
Step 2 : You have now entered the registry,Navigate to HKEY_LOCAL_MACHINE\ SYSTEM\ CurrentControlSet\ Services\ Tcpip\ Parameters\ Interfaces
Step 3 : Now under the Interfaces key try finding the correct key which corresponds to your network adapter.. view the contents of the key by clicking on the key and see if you find a key with your network ip address somewhat of the form 192.168.1.x or 192.168.0.x .That would most likely be the correct key
Step 4 : Once you have found it Create a NEW DWORD VALUE by going to Edit -> New -> DWORD Value and call it MTU
Step 5 : Double click on MTU to open its settings and choose the Decimal Option and type the MTU value ( as i said, first try 1492 , if that doesnt work then try 1454,1460,1452)
Step 6 : Then click on OK and close the Registry Window and Reboot your PC
Step 7 : This should do the trick and hopefully will be able to browse all websites successfully!!