Hi and welcome to Arturia forums.
Are you sure that Analog Lab is'nt allready removed and it's just a fault that it still appear in the controlpanel?
You can just remove Analog Lab 3, if you have installed Analog Lab 4 on its terms including as an all 64 bit application. If Analog Lab 3 allready is removed, then Windows will tell you in a dialog box.
Analog Lab 3 and Analog Lab 4 can afaik not be installed side by side.