1. This PC did not come with a Windows 10 Professional license or any Windows 10 license.  It only has a Windows 7 Pro license. If you purchase and use this device as-is your business is not considered in legal compliance with Microsoft and may be subject to major fines.2. Windows was installed in BIOS mode with UEFI & Secure Boot disabled.  Disabling secure boot is a major security vulnerability.  If you get one I recommend to format immediately and install with a legitimate copy of Windows 10 in UEFI mode with secure boot enabled.  Secure boot stops root kits from being able to infect the core startup of Windows.