***THIS IS SUITED FOR RETRO / VINTAGE / OLD SCHOOL GAMES***Fresh install of Windows XP Pro 64-bit. You are responsible for your own drivers. I did run Windows 11 Pro 64-bit on this and it worked fine. I can install a different OS of your choice. I can install drivers after confirmation of OS choice.OS: Windows XP Pro 64-bit SP1
CASE: Thermaltake V3 Black Edition
CPU: 2.40 GHz Intel Core 2 Quad Q6600
CPU COOLER: Dark Freezer X90
GPU: 1GB GDDR5 NVIDIA GeForce GTX 645
RAM: 5GB DDR2 800 MHz Nanya, Micron
HDD: 600GB 10K RPM Western Digital VelociRaptor
OPTICAL DRIVE: LG Super Multi GH20NS10
MOBO: ECS P43T-A2 (V1.0)
PSU: 330W SeaSonic SS-330HB