I can tell you how to disable cookies in IE 7 and maybe you can figure out for yourself how to do it in your browser.
Ii cant tell you about IE 5 because i don't have it. It's a really old browser and not secure enough. I really think you should upgrade to the latest one. It's more secure and has tabbed browsing features. You can download it from here: http://www.microsoft.com/windows/downloads/ie/getitnow.mspx
Here's how you can disable cookies in IE 7. Go to Tools --> Internet Options ---> Privacy --> Click on Advanced In the "Advanced Privacy Settings" window, select the checkbox for "Override automatic cookie handling", then select "Block" for both First party and Third party cookies. You can also select "Prompt", if you want to. Then you'll be prompted to either allow or block cookies individually at the time a website attempts to store a cookie on your computer.