Because the hardware architecture did not change between Windows Vista and Windows 7, the is the universally accepted standard for running this hardware on Windows 7.
We designed a lightweight that intercepts and translates: rtl8139d driver for windows 7
Testing environment: Intel Pentium 4 (2.8 GHz), 2 GB RAM, Windows 7 SP1 x86, RTL8139D card (PCI rev 0x10). Because the hardware architecture did not change between
RTL8139D Driver for Windows 7: A Complete Installation Guide 2 GB RAM