price of the free upgrade may just be your privacy, though, as changing Windows 10's intrusive default settings is difficult.

Technology journalists and bloggers are singing Windows 10's praises, often using the words such as "amazing,""glorious" and "fantastic." The operating system has been described as faster, smoother and more user-friendly than any previous version of Windows. According to Wired magazine, more than 14 million people have downloaded their upgrade since the system was released on Wednesday.

While the upgrade is currently free of charge to owners of licensed copies of Windows 8 and Windows 7, it does come at a price. Several tech bloggers have warned that the privacy settings in the operating system are invasive by default, and that changing them involves over a dozen different screens and an external website.