OK all i have figured out the problem (drumroll please) .. its a rather silly thing. I should have tried this before but all i need to do is "Run as Administrator" and the ruler, editing has started working. Thanks to all !! Hope this work…
hey guys, another clue to solve this problem. In my PC whenever i lost the ruler function (i.e press "ruler" and try to click and nothing happens) all the editing functions were messed up too i.e nothing happens if i try to draw a box, etc