Running Win XP

I am currently running IE7.

I installed IE8 but it would not display any .png files and they were not visible in Outlook Express 6. I did reboot my computer. As I could not find anything to enable seeing the .png files, I uninstalled IE8 and reinstalled IE7, which did not have the problem (before installing IE8 or after uninstalling IE8.) I did not try installing IE8 again (I generally give a program only one chance before I send it to the ninth level of hell).

My question is, what do I do to get IE8 to display the .png files on my computer? I did not find anything on the lounge to answer my question so I must be the only person in the world to have this problem.