1. Find any jpg on your computer. Right-click it and select 'open with'.
2. In the context menu that opens, select 'choose default program' (Tick the box that says 'Always use the selected program to open this kind of file'
3. Browse to Program Files > Internet Explorer > and click on 'iexplore.exe' ( or browse to FireFox if you prefer).
Click 'OK' to finish.
Repeat steps for .gif or .png if you want to.