The network has an interesting chart, which gives users the ability to reliably find the options to install the new Windows 7 on a computer with an already installed Windows operating system. In general, depending on what operating system you already have on your computer and what OS is required to determine the various possible options.

To begin with some definitions: "Custom Install" means "fresh install", ie the complete replacement of the current operating system or install Windows 7 on a specific disk or partition, separate from an already installed Windows Vista / XP. This means that regardless of where the system is installed, the installation of Windows 7 will be a basic, clean, it will not be any third-party applications or files. This installation of Windows 7 is almost always possible if the components meet the system requirements to install. "In-Place Upgrade" allows you to save all files and applications, and simply install a new OS over the old one.

Despite the fact that for the ordinary user is much more convenient options for updating the OS on top of already available, because such a transition would not need to reinstall all applications and restore files with foreign carriers, most likely, the majority of enthusiasts, in any case, choose a clean installation.

Yes, it seems, at this time, Microsoft has not too much flexibility. Not many chances for the user easily install Windows 7 on top of Windows Vista. Do not forget that if you want to install a new OS over the previous one must take into account not only the versions of both operating systems (Business, Home Premium or Ultimate), but their bit. When you change the bit can only be a net upgrade. And the users Windows Vista Starter Edition and Windows XP in any case would have to completely replace the operating system.