They may be the generic icons from a hotmail or some other online account or may originate from your temp inet files?
You could try to stop them, open OE - tools - options - security tab - check "block images and other external content...." apply - ok out of it , restart OE and see how you go.
If already ticked I can't think of anything else atm.
You could also try deleting all your history etc and browser cache it may be full.
The icon images are in a file called 'Image001.gif'. When opening the file you get to see a few pictures from recently visited places.
I also learned the following.
Let's say I got an email with 'Image001.gif'. I open it and see 5 images. Now I go to the internet for a few minutes and again I open 'Image001.gif' then there are
maybe 20 images! Indeed after using crap cleaner the recent
images are gone but the old 5 images are still there.