get a copy of ccleaneer and then do a full uninstall of chrome and then run the ccleaner and clean the registry aswell as unwanted temporary files that may slow down your computer... simply just uninstalling chrome and installing all over might make you see the same mezza again so thats where the ccleaner comes in .. after running ccleaner do a fresh install of chrome and your problem should be gone ...
alternatively
you could install a po up blocker that way you wont see the ads from the program anymore...
this is a annoying program that no one likes so you are not alone