QuickBooks Error 1625 arises when installation or updates are blocked due to system policies restricting the operation on your device. This error typically occurs with Windows Vista, 7, 8, or 10. To resolve this, navigate to the Control Panel, access "Local Security Policy," and adjust the software restriction policy to "Unrestricted." If the issue persists, reinstall QuickBooks after running it as an administrator. Keeping your Windows system and QuickBooks updated is also critical to avoid such errors.