Windows 7 Professional with Service Pack 1 installed and activated. This is a WD160GB. 2.5” SATA laptop disk drive that you should be able to install into your laptop and boot into Windows 7 Professional. Please note: Depending on the brand and model of your laptop, you may or may not need to install some device drivers. A Windows 7 installation disk and product key are not included. The asking price is only $35.00 plus $5.00 shipping. Methods of payment: US Postal Money order or Pay-Pal. (No personal checks.) Ships to (lower 48) US addresses only. (No international shipping!) A link to my website is available on my QRZ page. Thank you for your interest and enjoy your day.