I dunno, people seem to have problems with firewalls, from what I have read on other website,suddenly they can't access perfectly respectable websites they have surfed for years, things like that.
To tell the truth I hate putting any third party stuff on my machine
I remember one demo I got free on a disc, a kind of disc recovery thing, I am a tinkerer and every time I changed something it would reboot and change it back.
Fine I though, I will just delete it, when I tried it asked for a password which of course I did not have,I had to format my hard disc.