I have had no problem with Vista Home Premium-64bit for years. However as age takes its toll I need to permanently increase the number of dpi to 140. I am able to do this on a temporary basis using Tools-> Zoom but as soon as I reboot or even change windows-sometomes- the dpi automatically revert to 'normal' ie 100, the font size,as indicated in the DPI Scaling Control Panel remains at 140. Is there any way of permanently 'fixing' the dpi? Any help will be gratefully received.