PC Clean-up box

An offer to improve performance by adding I think PC Cleanup or something from AVG pops up and says I have 4.6 Gb o f junk files( and 3 duplicate programs) ???  Isn't that a lot of data?
I'm not sure what this means and how would it affect performance?
Sorry I'm a novice…

Hello William,

This popup message occurs when you installed AVG PC TuneUp trial version on your computer. Please check if the program is expired or not, if so uninstall it from the control panel to get rid of the popups.

Hello William,

This popup message occurs when you installed AVG PC TuneUp trial version on your computer. Please check if the program is expired or not, if so uninstall it from the control panel to get rid of the popups.