Why not? For all thinking about updating, you might want to proceed VERY carefully, or you will wind up with your browser changed over to a virus- Chrome. I did not see anything about corrupting my computer with that garbage, and I have no idea how much it is going to take to get back to normal. The first problem, it killed my shortcut to Free Republic!. God only knows what else it did.
You’re talking about PUPs, Probably Unwanted Program(s).
Just be careful during the installation. Look at each screen carefully before clicking Next. You may want to unclick some default choices.
Ccleaner is not the only ‘free’ software doing this. Others are as well. It’s a way for them to make money.