First delete the partitions that you created for installing Linux.
NOTE:DELETE THE PARTITION MADE FOR LINUX ONLY; IF YOU DELETE ANY OTHER PARTITION THE DATA CANNOT BE RECOVERED.
WE DO NOT BEAR ANY RESPONSIBILITY FOR DATA LOSS.SO BEFORE YOU DELETE CONFIRM THE NAME OF THE DRIVE AND THE EXTENSION FROM THE LINUX OS BEFORE YOU DELETE IT TO AVOID ANY ACCIDENTS
Then insert the windows recovery disc (windows vista and windows 7 or any version ) .The click the appropriate languages and select repair your computer and select command prompt and type the following commands in it the restart the computer.
That is all you need to do.Now restart the you computer.