trouble with accessng certain web site pages

Hi,
Just wondering if someone could please help me. I have recently set up my notebook computer and just got connected to dial up internet. For some reason there are certain web sites - such as yahoo email and msn chat that I cannot get access to. When I attempt to get into the pages it appears to attempt and the heading is the only section of the page that appears (the rest of the screen is white).

I was wondering if this problem might have been caused by the following: When I was on the net the other day a pop up mesg came up with something to do with giving me two options 1 being to view the web page with pictures or without as it was not a secure site and the pics could contain a virus. I chose without, now I think maybe it has now defaulted as setting. Could anybody please shed some light on this little problem please?

Please don’t duplicate posts for the same problem, this just diplicates effort for those trying to help.