Using Windows XP on a Dell Inspiron 6000 laptop with automatic updates. Following an incomplete (even after many,many hours) Bitdefender deep scan that killed 9 Trojan viruses, when I came back on to continue after hibernation, the display had changed to very enlarged presentations of the active applications which did not fit in the screen. In fact a pop-up box came up to tell me that there wasn't enough room to display multiple applications. I went to Control Panel/Display/Settings/Advanced and changed the DPI setting to "Normal - 96 DPI". The final result is normal size application display, but the usable area of the screen is now narrowed to 10.75 inches instead of the 13 inches of surface width. The vertical usable area has not changed. Can anyone say how this happened or how to restore normal, original operation?
