Crack Driver Booster 9.1 Pro is an unofficially modified version of the legitimate Driver Booster 9.1 Pro software, which is designed to update drivers on your computer. Using such cracked software is risky because it may contain malware or other harmful elements that can damage your system or compromise your personal information. Additionally, it’s illegal and can lead to legal consequences or issues with software functionality. It’s always better to use official, licensed software to ensure safety and proper support.