What is your operating system?

Do you want to know what operating system is installed on your PC or Mac? Discover in a few seconds what version of Windows or Mac OS X you are running on: surf to microsoft.com or apple.com.

You will also see which processor you have (32-bit or 64-bit) and other details about your operating system (Service Pack, Build, etc.).

Do you have a Windows PC?

Microsoft Windows

Do you have a Mac?

Apple Mac OS X

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