If you do a google search on asafecentre, you will find plenty of recommendations for it's removal. The only problem is which solution will cost little if any money! There is reference to the majorgeeks forum there which is frequented by experts dedicated to eradicating the problems your son is having.
I had a bit of a problem a few months ago so I joined their site. Before posting a query, they ask you to carry out a through cleansing in accordance with their instructions (free). I followed these to the letter and BINGO, problem solved and no need to post.
P.P.