we implemented multiple techniques to secure the operating system and ensure data confidentiality and integrity. The activities included: Enabling BitLocker Encryption: We encrypted the system drive using BitLocker to protect data in case of device loss or theft. Testing Access from Another Account or OS: We attempted to access the encrypted data using a different user or system, confirming it was inaccessible without the proper keys. Using EFS (Encrypting File System): We encrypted specific user-level files using EFS to ensure data protection within the same system. Key Management: We explored how encryption keys are stored and the risks of losing access if recovery keys are not backed up. Vulnerability Analysis: We discussed potential security gaps, such as poor recovery key protection or elevated privilege misuse. Security Recommendations: We suggested security enhancements like enabling two-factor authentication, restricting user privileges, and securely backing up keys.