Windows 7 Install fails because it's already installed. But It's not installed.

Is anyone familiar with this problem?

Do you have any other applications open that happen to have RStudio in the name / window title?

No. Not at all. Not unless the browser being open to the page counts.
But that seems like a poorly constructed installer if that is going to interfere
with installation.

But I closed the tabs connection to the site and it still failed.

Everything is as shown in the screenshot.