Files deleted from the Library and now internet doesn't work?

Hello,
I'm new here and this is probably going to sound dumb but... my father deleted some files from the Library by mistake and now internet doesn't work in his computer. Everything seems normal, but the webpages don't load (we tried lots of pages and 3 browsers). If you try to update any software it can't connect to the internet either.
He reinstalled the system (it's Mountain Lion, I think) but it didn't worked (it was a partial reinstallation, without losing the data). He also tried restarting and pressing CMD-R but nothing happened.
Any ideas on how to solve this problem? Thank you so much in advance! (and sorry for any typos, English is not my native language)

Hello Eleone, & a warm Welcome!
So what exactly isn't working or any messages you get?
Does Mail still work?
Might try this...
Make a New Location, Using network locations in Mac OS X ...
http://support.apple.com/kb/HT2712
10.5, 10.6, 10.7 & 10.8…
System Preferences>Network, top of window>Locations>Edit Locations, little plus icon, give it a name.
10.5.x/10.6.x/10.7.x/10.8.x instructions...
System Preferences>Network, click on the little gear at the bottom next to the + & - icons, (unlock lock first if locked), choose Set Service Order.
The interface that connects to the Internet should be dragged to the top of the list.
If using Wifi/Airport...
Instead of joining your Network from the list, click the WiFi icon at the top, and click join other network. Fill in everything as needed.
For 10.5/10.6/10.7/10.8, System Preferences>Network, unlock the lock if need be, highlight the Interface you use to connect to Internet, click on the advanced button, click on the DNS tab, click on the little plus icon, then add these numbers...
208.67.222.222
208.67.220.220
(There may be better or faster DNS numbers in your area, but these should be a good test).
Click OK.

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