on my family computer at home although we have k9 and most things are blocked there are images which can be viewed and acc. to my understanding they are difficult to block and i wouldnt be able to tell my father easily enough especially bc its not straight forward.what do i do???
i dont want to fall but if noones home its inevitable...

How about to make a commitment, before you will turn on the comp. you will give 10 dollarim to tzedoko? or 20. or 30.

could you tell him that "something pritzus popped up" (I stress, DO NOT LOOK FOR SOMETHING!! Just say it happened) and that the filter should be made tighter?
the other option is accept the psak (I know that Rav Mordechai Willig says this explicitly) that being alone with a computer is yichud. I am trying to work up to that, and right now will only allow myself on the internet if I am in a public place (no one home and/or door closed) if I have a concrete task (check email, look up something for school/work) and not allow to click on ANY extraneous links etc. it relies on a certain level of self trust, but definitely effective.
bhatzlacha

it wouldnt help bc i would search things with my parents in the house and just switch web page when i could hear them coming

How important is it that you be on the internet?

How important is it to you that you be free?