I just installed windows 7 64-bit a few days ago, and had to open a .doc file for an assignment. I had to use a piece of software called MatLab to do the problem, so I stupidly assumed that I should open the .doc file with that. I realized right away that I should have used office word to open .doc files and that I should set word to be the default. I went back into open with, set to default and selected word, but the grey box to click in order to always use word to open doc files wont let me click it. I also tried going to start,default programs, and changing the default for .doc in there too, but when I choose office word as the program it doesn't change. It still sticks with that darn MatLab software (which wont even open it anyways! uhg! so frustrating!) Can you help!?