If you are reinstalling an older operating system (like Windows 7) or trying to get hardware acceleration working on a newer one, here is how to proceed.
: Fully supported with official drivers from the Intel Download Centre . Windows Vista (64-bit) intel r atom tm cpu n455 166ghz drivers
— CPUs don't need separate drivers. You need: If you are reinstalling an older operating system
For the Intel Atom N455, always try Windows Update or the official Intel Assistant first. ASUS Eee PC
What is the of the laptop? (e.g., ASUS Eee PC, Acer Aspire One?) Which specific driver is missing? (Video, Wi-Fi, or Audio?)