Here’s how to trick your system into thinking Internet Explorer is not installed so that you can reinstall it.

Problem description: When you try to reinstall Internet Explorer 6 in Windows XP, you get a message that says:

?Setup has detected a newer version of Internet Explorer already installed on this system. Setup cannot continue.?

You can trick the Windows registry into thinking Internet Explorer 6 isn?t installed by doing the following.

1. Click START–>RUN–> and type REGEDIT in the open box.

2. Go to the following registry key.
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Active Setup\Installed Components{89820200-ECBD-11cf-8B85-00AA005B4383}

3. Double click on the {89820200-ECBD-11cf-8B85-00AA005B4383} folder and set the value data to 0.

4. Download the ie6setup.exe and launch it to reinstall Internet Explorer 6.