Windows 7 with Service Pack 1 is officially required. Processor: Intel Pentium 4 or AMD Athlon 64.

1GB minimum, though 2GB to 8GB is highly recommended for better performance, especially on 64-bit systems.

When prompted, enter your legitimate 24-digit product key. If you purchased an upgrade, you may also need the serial number from your previous version (e.g., CS4 or CS5).

Right-click Set-up.exe and select Run as administrator to ensure the installer has the necessary permissions.