Hello,
It seems like your laptop encountered a critical error during startup, possibly related to system configuration or registry issues. "Bad system config" and "registry roll back" errors indicate potential problems with system settings and registry entries, which can lead to startup failures. While "system restore" typically reverts system settings to a previous state, it's unlikely to affect your files if you've never created a restore point.
Regarding the possibility of HDD failure, the symptoms you've described, such as sudden startup errors, loud fan noises, and occasional software issues, could indeed indicate hardware problems, potentially with the hard drive. However, you can consider using data recovery software or...