unable to surf

[eluser]sasori[/eluser]
I know this forum is not for network stuff but, is there anyone of you experiencing this,
I noticed that after some hours of using codeigniter,
there are times I am not able to surf this site, the manual, or other sites like
google, yahoo, facebook and etc, unless I restart my lappy or use my neighbor's IP.
do you have any idea why is this happening ?
as far as I remember all I did was
use codeigniter,

I added in my host file from (system32/drivers/etc)

Code:

myCIsite 127.0.0.1
mycisite 127.0.0.1

and then I added these stuff to my httpd-vhosts.conf in xampp

Code:

<VirtualHost *:80>
    ServerAdmin my_email@mydmain
    DocumentRoot "C:/xampp/htdocs/myCIsite/"
    ServerName myCIsite
    ServerAlias myCIsite myCIsite.com mycisite
</VirtualHost>

http://i45.tinypic.com/74g8.jpg

* even if I restart OR stop my xampp, still am not able to view other websites
unless restarting the machine itself