I can't open "http" pages using Internet Explorer but can open "https" page

I've got Internet Explorer 6.0 SP1 installed on my Windows XP home computer. I'm able to open web pages begining with "https" (secure pages) but unable to open pages begining with "http" (regular pages) in the address.

I've got Mozilla Firefox 1.5 also installed and it works alright...

What's causing this problem? How can it be resolved?

NOTE:

I require to use Internet Explorer to access my online banking site. It doesn't work with Mozilla Firefox or any of the other browsers.

I've been told that there's a Memory mismatch with the motherboard on my home computer.

The Internet Explorer settings are the default settings on installation...

I'm using ZoneAlarm as firewall and BitDefender as anti-virus software. I'd earlier un-installed these software to connect to the internet. It still had the same problem without the firewall and anti-virus software. I don't get any error messages. The page does not display any error messages and the status bar does not display any messages.

I can't open "http" pages using Internet Explorer but can open "https" pages!?microsoft office 2003

u could re-install IE6...but think it is a waste of time ....click internet options click programs..scroll down to security settings and check the box for http...this will open it with any browser...what i had to do with my foxfire mozilla

I can't open "http" pages using Internet Explorer but can open "https" pages!?windows xp professional internet explorer

reinstall IE
are you sure about this??? internet explorer 7.0 beta does that. But im pretty sure 6.0 is alright. Better reinstall if you are indeed using 6.0
Get rid of Beta no good for windows
Simple way to reinstall