Advanced mac cleaner is a fake utility which infects mac computers and tries to sell itself as a utility which will clean the mac and make it run faster. However, the utility itself slows down the mac and makes up the scan results, thereby attempting to convince the user with the 1000+ issues it tries to say are impacting the system. Instead, we recommend that you click go, utilities, activity monitor, find advanced mac cleaner, and select force quit. Then remove it from the system and use a program to scan your system.
From there, always try to only go to websites which are well known to potentially avoid issues like Advanced Mac Cleaner. Above all, make sure to remove it and clean your system to make sure no remaining pieces are still there. If you have any questions, please feel free to ask below.