Memory Upgrade:This system supports 8 GB of RAM (2×4 GB Modules) however 8 GB of DDR2 RAM is more expensive than it is worth and the 32 Bit OS maxes out at 4 GB RAM. This can also be purchased using the affiliate link above. Operating SystemIt is recommended to install Windows 10 on this system see. The Windows Vista OEM or Windows XP Product Key won’t be compatible with Windows 10 Installation Media however you can run Windows 10 Unlicensed. Windows 10 will have most of the system drivers required inbuilt however you can install the Windows 7 Drivers if you have any unknown Devices in the Device Manager.
Dell Latitude D630 Wifi Drivers For Windows 7 32 Bit
Drivers and Downloads for Windows 7 Legacy BIOS.