Windows 8.1 will bring back the beloved Start button, but if you don’t already own a Windows 8 machine the upgrade will cost you a bill or two.

Win8.1 Boxshot LeftAngle 524993DF Windows 8.1 retails for $119.99 and Pro for $199.99, comes as full version software

Windows 8.1 will be a free upgrade for those that are currently running Windows 8, but those wishing to upgrade from anything other than Windows 8 will have to pay $119.99 for either the retail DVD box or download via the Internet.

Consumers that want to grab Windows 8.1 Pro will have to fork out $199.99, but people who purchase computers with Windows 8.1 pre-installed later this year can opt to upgrade their OS to 8.1 Pro for $99.99.

Another thing to note is that Windows 8.1 is offered as “full version software,” meaning users do not need to have a previous version of Windows in order to install the latest Microsoft OS. This applies to both the retail as well as the download.

Some other tidbits to keep in mind should you choose to upgrade from Windows 7, Vista and XP is that upgrades from Windows 7 will require users to reinstall their desktop apps.  Microsoft does not recommend upgrading a dated Windows XP or Vista machine, but should they choose to they must back all their files and do a fresh installation.