1: Clicking on links in emails is a VERY bad idea. You should copy and paste the link into your web browser, then inspect it to make sure what was copied and pasted is the same as what was showing in the email program, THEN you can consider going to the site.
1A: Using Outlook isn't exactly doing yourself any favors on security
2: Just set your default browser to whatever you use, and hopefully that something isn't Internet Explorer to compound the security issues you already have with Outlook.
2A: That is assuming you want to throw caution to the wind and enjoy cleaning up after malware that invades your system
And a bonus point
3: Forget you ever heard of the Windows registry. Seriously. Based on the approximate level of technical understanding you appear to possess, that is very dangerous knowledge for you to have. Especially since you seem to be so cavalier about tinkering with something you haven't the faintest clue about. Honestly though, outside of developers and debuggers, no one ever really need know anything about the registry. The 99.99999999999% of us who do not fall into that category would likely have far fewer problems if we collectively forgot about the Windows registry.
I recently downloaded Google Earth but neglected to uncheck the Google Chrome Browser option, hence I got the browser on my machine.
I didn't want it so I uninstalled it, and now the URLs in my Outlook emails files won't open.
I've found I can solve this by downloading Chrome again, but I don't want it on my machine.
Does anyone have a cure for this please - is there a registry tweak I can do to sort it, for instance?