acbtnmgr_x84-x85.exe is known to be part of a process called Lexmark Printer Software, and these have been confirmed as safe.

Adware and spyware sometimes have the same name as essential files, so it is a good idea to scan your computer to be sure.

The best way to avoid problems with adware and other types of adware is to scan your computer for free and get rid of all the rogue files right now.