just a heads up to anyone who uses adobe reader 8. i am useing a compaq, p3, xp os. i downloaded 8 from adobe, and two third party sites after i installed/uninstalled at each try. it NEVER opened from ANY pdf file i tried. i removed it for the last time and am now useing another product, it works everytime. i have a feeling that the download program itself has a bug since all 3 trys failed. just thoyght you should know in case you run into this problem. i have no solution. i have left a email for adobe so they can investigate. hope this helps someone.