Only google Sites are not Opening in my Pc ?

in simple language, if u can open google like this "64.233.161.100" but not with "www.google.com" then it means that your DNS server is not working properly.
In that case, click on your Connection, the blinking icon in the right hand side. click on properties and double click on Internet protocol

.
There'll be an entry there which says:
"OObtain Dns server automatically"
or
"Use the following DNS server address"
choose this second one and type in
"218.248.240.46"
and alternate as "218.248.255.146"
it may fix your problem.