*** Internet Explorer problem ***

I was looking around in the registry to try and rectify a problem which I was having with my IE 6 ( which kept over-riding my existing homepage and defaulting to www.dell.com ) but have accidentally changed something which is now preventing IE 6 from opening at all. I have tried downloading the new version of IE (IE 7 as it happens) from www.microsoft.com - this has been unsuccessful. I then tried to download IE 6 again but now the set-up wizard fails at the "Preparing Setup" installation box stage and has an error message which reads:

 

"Setup has detected a newer version of Internet Explorer already installed on the system.

 

Setup cannot continue."

 

I have tried to uninstall IE 6 and start from scratch but this has been far from successful and it appears I cannot remove IE 6 completely.

 

Any idea how best to progress please?