Many companies, even popular ones like Adobe, include ‘addition’ programs with their installs. They do this to offset the high price of developing free software.
The problem is that most of the time, these ‘additional’ programs are unneeded and unwanted. For example, McAfee anti-virus might get installed while you already have Microsoft Security Essentials installed.
Before too long, your computer is running like crap.
To make things worse, some companies promise huge benefits if you install their Registry Cleaner or Speed Booster or whatever, only to silently install adware, spyware, and even malware.
ICE keeps your computer from installing anything.