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i can ping but no aplication can use internet

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i can ping but no aplication can use internet

ahmadi3d_ali
hi
my system was infected and was downloading and uploading on its own! i installed all kind of anti virus and programs and finally i deleted the virus !
now when i connect to connection i can ping all sites!
but all my browsers (Opera , Chrome , fireFox , IE) give me error after trying to open a site!
also my skype and all other aplication do the same!
my internet download manager think im not connected !
i tryed giving DNS manually and i checked all options ! i tryed restarting all services and ..
i dont have restore point! so dont say restore it!
and i dont want to install another windows!
it seem that the antivirus deleted some important file that were infected! ( i used Rescue mode BitDefender )
and now there seem to be problem !
is there anyway to fix this or repair the windows? i used Microsoft Repair Windows but ... it didnt work!
i also tryed SFC\scannow but ...
and entering IP doesnt work either! (like enter the IP for google in browser not the adress )
im getting crazyyyyyyyyyy! please help me!!!!!!!!!!!!
Thanks
System Properties :
Windows 7 64bit
internet network : (i use a Lan to connect to my Modem and i make a connection (Broadband) to connect the ISP!