When I go to yahoo.com, the YAHOO that is supposed to be displayed at the very TOP isn't showing.  Also, whatever ad is on the page for that day isn't showing either.  It's just white space.  I have java installed and it still doesn't work.  I have already deleted temporary internet files, my cookies, defragmented my computer and did a disk cleanup.  HELP!

Oh, and ANOTHER site did this too (the banner didn't show up)

It's not yahoo, it's our computer!  I know this because I have been on several different computers and yahoo shows up fine. I am desperate!!!!  

I know someone can help!

I noticed that the ads or whatever that won't show in yahoo, well, they are FLASH..and I installed it, but still, NO SHOW!

GRRR! What operating system and web browser are you using ?

Have you changed any settings recently to your firewall if you have one ?

Or added a Windows Update Service Pack ?well, FIRST off, I'm using windows xp and ie
It's hard to say about the computer's settings because 4 people use it!  I have deleted my account and put it back on to try and get things working again and it doesn't work.

We have the service pack 2, but I don't think it has anything to do with it.  No, I haven't changed any settings to the firewall.

My step-dad refuses to click on the updates because he thinks a virus will get in.

A bigger PROBLEM developed tonight, my address bar is gone!  I have checked it to be on and all I see is Address in gray at the top.  Also, I did a spyware scan and several things named hijack and all popped up!!!!! Download and run http://www.intermute.com/spysubtract/cwshredder_download.html
That should be a quick & easy fix without having to go through the hijackthis routine.