IMPORTANT UPDATE: Microsoft no longer allows upgrade from Windows 7 to Windows 10 with the same Activation Key so please disregard the information below about how it's possible to Activate Windows 10 with the Activation Key of Windows 7. You will need to purchase a Windows Activation Key from Microsoft if you are upgrading from Windows 7. 500GB Hard Drive Laptop 2.5? Windows 10 PRO Legacy 64 You will receive a major brand name Hard Drive like Seagate, Western Digital, Hitachi etc.. Condition: Used, Refurbished, Fully Tested and Working. THIS HARD DRIVE DOES NOT COME WITH ACTIVATION KEY FOR WINDOWS. IMPORTANT NOTE: Windows 10 PRO was installed on this Hard Drive in Legacy Mode. If your System has both UEFI and Legacy Mode, then make sure Boot Mode is set to Legacy mode otherwise your system will not detect the Operating System on this Hard Drive. If your system has UEFI mode only, then this Hard Drive will not work in your Laptop. ACTIVATION: This is a genuine version of Windows - not a pirated 'pre-activated' one. Activation therefore may be required. - If your computer came with Windows 10 pro/8.1/8 pre-installed then you don't need to do anything. Windows will automatically detect your system's digital license (which is embedded in the hardware) and activate. - If your computer came with Windows 7 Pro then you will need to enter your 25-digit license key which found on the Windows COA sticker of your laptop/desktop. (This is usually on the case for desktops, and on the base or under the battery for laptops, and printed in the following format: XXXXX-XXXXX-XXXXX-XXXXX-XXXXX). - If you have your own Windows 10 pro/8.1/8/7 product key or are planning to buy one, then these can be activated the same way as above. -You are buying a hard drive, with a Pre-installed Windows. This is ideal for new computer builds or to replace a dead or dying drive in an existing computer. -No technical knowledge is required. Simply install drive in your Laptop, Power it on, let it automatically update devices for your hardware, and you're good to go! IMPORTANT NOTE: DRIVES WORK ONLY IN LEGACY MODE ! DRIVES ARE MADE MBR!!! IN COMPUTERS NEWER FROM 2014, YOU MAY HAVE TO GO INTO BIOS AND DISABLE SECURE BOOT AND ENABLE LEGACY/CSM BOOT. It's very simple and easy, takes less than 2 mins. (There are many Youtube videos that will show you how to do it. Just search enable legacy boot for your laptop model Package Content: 1x2.5? 500GB hard drive Returns: As with all our items we have a 60 day return policy. Item must be in original condition for a full refund. Depending on the item condition upon return, we reserve the right to decide whether to issue a full or partial refund. Shipping: Shipping is via USPS 1st Class Mail or Priority depending on Order Size. While may show you an estimated delivery date, this is not guaranteed as USPS has no guaranteed delivery times for 1st Class Mail. We will ship within 1 business day of purchase, after that we have no control over delivery. If you need your hard drive faster, then choose the Priority mail option. USPS Priority Mail which has 2-3 day delivery times depending how far you are from CA