Who's a naughty boy then?

Seriously, you should never load the beta of an existing application into the same OS instance. Particularly on a production machine.

This is a real issue with MS software as it is very closely integrated so you are likely to overwrite files on installation and delete shared files on uninstallation

Have a look in your IE <tools>. There are options for "autocomplete" in the <advanced > and <content> tabs.