While basic Realtek audio drivers are small (15-30 MB), the full "High Definition Audio Codecs" package with Sound Manager, equalizer presets, and surround sound virtualization can reach 200+ MB.
This data rate is characteristic of a throttled server, a weak Wi-Fi connection, or a legacy DSL/3G internet connection. For a standard Windows 7 driver package—such as an graphics driver, a network interface card (NIC) installer, or a motherboard chipset bundle—225 MB is a very typical file size. Common Hardware Using 225 MB Windows 7 Drivers 25 Minutes 225 Megabytes Driver Download Windows 7