For no reason I can determine, when I clicked on IE8 icon, I got a window saying that it encountered a problem and was shuting down (before it ever opened). After doing this a few times, I expended the "details" links and found that the program wanted to "attach" a file called _appcompat.txt. I don't have this file on my PC. I decided to completely uninstall IE8 which brought me back to the default version IE6 on my XP sp3 DELL 4700 PC. I then re-installed IE8 but got the same result. I would apprecaite some assistance. What's wrong? Many thanks.