iexplore process keeps on opening up seems to be laoding something

hey there ,
I have noticed that my computer seems to automatically open up the “iexplore.exe” process and this seems to load something as its memory usage keeps going up and such .

i kill it and then it loads back up again

i scan with norton 2006 nothing

scanned with windiws defender nothing

scanned with adaware and comes up with some MRU tracking cookies but thats it and when i delete them it comes back after a while

also the only way i can stop it from taking up lots of memory is by blocking iexplore.exe with norton firewall

any suggestions