windows xp and internet explorer problem

Ok guys and gals hope someone can help here because i am getting frustrated......my sister has a new dell computer and dialup....when she gets online she connects and gets to most sites but if I try and get on any site where we have to logon such as my banking site or a site or credit card site etc. then it displays the old "this page cannot be displayed".......i have checked all her security settings and they look fine....how do you do a repair of internet explorer 6 in XP....or any suggestions on what I need to do to get this thing working correctly......i also went to the microsoft updates site to try and download the latest updates and it gave me the following message......Your current security settings prohibit running Active X controls on this page.....i checked the controls under the custom settings on the security tab and they are set to Medium - low so they should work .......so it seems the active x controls are not behaving as they are set....HELP please

 

Here is a link to Microsoft article on how to do a repair install.

http://support.microsoft.com/default.aspx?scid=kb;en-us;318378

 

Just for fun, try going to Tools, Internet Options, Privacy and put it all the way down so it will accept 2nd and 3rd party cookies. Click ok, close IE and reopen and try it.

 

I think I have tried this but Ive tried so many things I will try again and let you know...thanks for the info and the help