Don't think I've heard of this one before, but ....
So you haven't been able to finish the install a fresh 3.4.3?
There was a 'more info' link in your screen shot. Did you click it and see what it said?
A fresh install requires a new code directory, a new db (not one used before with another moodle) and a new moodledata directory.
How did you attempt the install?
No Vulcan Mind Meld possible ... so you are going to have to provide some details.
'spirit of sharing', Ken