CHANGING WORD TEMPLATE

SOMEBODY HELP ME OUT TO CHANGE THE MS WORD TEMPLATE. WHENEVER I OPEN THE APPLICATION (MS WORD), A SPECIFIC WORD DOCUMENT OPENS EVERY TIME & IF I CLICK ON FILE>NEW OR PRESS CTRL+N FOR CREATING A NEW DOCUMENT, THE SAME FILE/DOCUMENT OPENS AGAIN. HOW MUCH I OBSERVED, IT IS SOME KIND OF CHANGES IN THE DEFAULT TEMPLATE. BUT I DON’T KNOW THE OPTIONS, HOW TO GET IT BACK i.e. NEW WORD DOCUMENT WITH A BLANK PAGE, NOT WITH THAT PARTICULAR FILE WITH IT’S CONENTS. THE FILE OPENS IS A CASH MEMO OR A COMPANY LETTER PAD.