STEP 1:- Press Start button on your Computer and open Control Panel .
STEP 2:- Open Networking and Internet and then Open Network and Sharing Center.
STEP 3:- Now Click on "CHANGE ADAPTER SETTINGS"
STEP 4:-Right Click on the Network Connection whom internet you want to share and thereafter Select PROPERTIES.
STEP 5:- After that Select SHARING tab and Click on Allow Other Network Users to Connect through This Computer’s Internet Connection then press OK.
You may click Allow Other Network Users to Control or Disable the Shared Internet Connection but that is Optional not necessary.
STEP 6:- Now you need to make a Ad-hoc network connection which is also very easy to make .Click on link below to make a Ad-hoc network connection:-