It seems like you're encountering difficulties installing Windows 7 on your new 320GB WD Black HDD in your Acer 5720 laptop. Here are a few steps you can follow to help diagnose the issue: 1. Check Compatibility: It's essential to ensure that the new HDD and your laptop are compatible. While WD Black drives are generally reliable, it's good to confirm compatibility with your specific laptop model. 2. BIOS Settings: Make sure your BIOS settings are correctly configured to detect and boot from the new HDD. Some laptops have specific settings related to SATA modes (IDE, AHCI, RAID). Check if any adjustments are required. 3. Windows 7 Installation: If the system freezes during the installation process, it could be due to a...