this worked for me and i hope it will owrk for u guys 2
(srry if this has allready been said)
1.go top start menu, type in CMD in the ''search field''
2. Type "ipconfig /release" (without the quotes, on the command line by itself).
3.Type "ipconfig /renew" (without the quotes, on the command line by itself).
and thats that:) if your internet is connected directly to your modem then go on google and search for ''ip switch'' and you will find on the top, a more thorough guide
gl and hope it works:))