Do you 'need' the Yahoo toolbar? You can set Yahoo as your search engine by choosing Tools, Manage Add Ons and then click on Search Providers. Choose Yahoo, Click on Toolbars and Extensions and disable Yahoo Toolbar (right click, disable). Restart IE. The problem with toolbars is that their behavior is unpredictable.

the very best way is to do exactly what you are doing and ask, that way you can get replies from those who have tried it and like it also if there were any problems or glitches, you can also check other support forums for problems listed with a specific update. I do that prior to doing any of my windows updates, I check the forums for comments and if there are problems I wait till I know they have been resolved. As far as IE8 goes there are some conflict problems with certain programs which is why it is a very good idea to read up on it and if you are running those programs be prepared prior to install. I go to google and google IE8 Conflicts and find a wealth of info. Since every system is different there never is a guarantee that any one program will work the same way it does on any other system, so we do have to take chances sometimes and just dive in with fingers crossed.

go to security center in control panel look on the left and select change the way security center alerts me.

"Everytime I start Windows Explorer 8 the web page displayed does not open on the full screen,I have to keep dragging down the bottom of the frame to the taskbar. As many times as I do this the problem keeps coming back." See link for possible help. Here is a link that might be useful: See if anything here helps you.