Many PCG-81212M laptops originally shipped with Windows 7 64-bit. If your machine currently has a 32-bit version installed, upgrading to 64-bit is highly recommended to utilize the full 4GB to 8GB of RAM these motherboards support. Ensure you download the 64-bit versions of all network and graphics drivers to match.
Could you tell me (e.g., graphics, Wi-Fi, or audio)? I can help you locate the exact download link or troubleshoot the installation. Sony Vaio PCG-81212M - Laptops - Revamp IT Sony Vaio Pcg 81212m Windows7 Drivers Download
Since Sony no longer hosts official drivers, use these trusted sources: Many PCG-81212M laptops originally shipped with Windows 7
DriverPack offers an automated driver update tool for Sony Vaio laptops, including Windows 7 compatibility. While convenient, use caution with automated tools and always scan downloaded files. including Windows 7 compatibility. While convenient