I had downloaded IE8 Beta 2 and installed on my home PC. Below is my experience on the installation.

Uninstall Internet Explorer Beta 1

If you had IE8 Beta 1

and you tried to install Beta 2 over it, you will get an error message

However removing IE8 is not via the normal ‘Add/ Remove Programs’ or ‘Programs and Features’ menu in Control Panel.

To uninstall Beta 1, go back to Programs & Features.

Look at the left hand panel, search for Installed Updates. You can see a screen as above when you click on it.

Right click on Windows Internet Explorer 8 and click Uninstall. Then you will get a prompt as shown above.

Confirm and wait for the uninstall to complete. You will be prompted to restart the PC.

Install Internet Explorer Beta 2

Once restarted, double click on the installer file and wait for the intro screen

It will ask you whether to install updates or not. Up to you but I uncheck the box.

That’s it!! Simple installation process now started copying the files.

Again it ask you to restart the PC.