Serial Keys of Windows 8.1. Windows 8.1 key is the latest update provided by Microsoft for the Windows 8 users, and this new update will give all the users more features in the operating system. This new update has added authentic and more attractive features. The users who have already activated Windows 8 can easily activate Windows 8.1 for free. The Product Key determines which Vista version gets installed. There are 2 Vista disks: one for 32bit Operating System, and one for 64bit Operating System. If a clean install is required with a proper Vista DVD (not HP, Dell Recovery Disks).
You might want the model name or serial number of your Mac when checking warranty coverage, searching for specifications or other information about your model, creating a home inventory, and more. Identifying your Mac model is also important when selling or giving away your Mac or learning whether it's compatible with the latest operating system or other software or hardware.
Use About This Mac
Choose About This Mac from the Apple menu () in the upper-left corner of your screen. About This Mac shows an overview of your Mac, including the name and version of its operating system, its model name, and its serial number:
If you see an About This Mac window like the following, double-click the version number beneath “OS X” to reveal the serial number:
Check Operating System Serial Key Replacement
Use System Information
Open the System Information (or System Profiler) app from the Utilities folder of your Applications folder, or click the System Info (or More Info) button in About This Mac. Select Hardware on the left side of the window, then find the model name and serial number on the right:
Check Operating System For Errors
If you can't use About This Mac or System Information because your Mac doesn't finish starting up, look for a serial number or model name on the outside of your Mac, or on its original packaging, receipt, or invoice.
Windows Check Operating System
You can also log in to appleid.apple.com and look for your Mac in the Devices section. Click on your Mac to view its serial number.
Find Operating System Key
Check Operating System On Mac
If you still need help, find an Apple service provider near you.