IBM Lenovo Thinkpad T61 160GB SATA Hard Drive with Caddy, Windows 7 and Drivers Preinstalled Operating System: Windows 7 Professional 32-Bit Comes with instructions on how to install hard drive and activate with your product key Most Common Drivers Installed, Alternative Drivers Saved on HD Made for the ThinkPad T61 laptop only. Buyer must have a Product Key for the installed operating system