If the drive is completely full of data, then no.
If, however, you're referring to the most common setup, where there is a single partition covering the entire drive, then you simply need enough free space on the partition, and the Linux installer will then repartition the drive out of the free space, and create a dual boot setup.
You can right click on the main drive in Windows Explorer (typically C:), select properties, and see how much free space you have. If you have a few Gb's free, that's enough to get you a basic Linux setup.
Ubuntu should run on a Dell Dimension 4600, provided enough RAM is installed. I'm not sure what you mean by "run Windows finally;" Windows is a separate operating system from Ubuntu. One does not typically run operating systems "on" one another.
You can update Ubuntu later as well without any issues. ... If there are other operating systems installed, you may get the option to install Ubuntu along with them in dual boot. But since your goal is to only have Ubuntu Linux on your entire system, you should go for Erase disk and install Ubuntu option. Read More:- hands-on.cloud
Yes Linux can be installed on the same computer.
Ubuntu is a whole operating system, not a simple program. It does not run on top of Windows, but instead of it. Thus user accounts on Vista do not come into play. Ubuntu supports its own user accounts, so once it is installed, no one except the person who installed it can use it unless an account is created for them.
Ubuntu
It uses a heck of a lot less memory than Windows does, the exact amount depends on what you've installed. Otherwise it depends on your hardware.
Ubuntu generally creates a different partition on your hard drive, formatted with the EXT4 filesystem. Therefore, without special software, you cannot access your files on Ubuntu from Windows. However, you can access your Windows files from Ubuntu without any trouble. When Ubuntu is installed, you get to choose whether to boot into Ubuntu or Windows when the computer turns on. That means that you cannot be actively logged into both Windows and Ubuntu on the same computer. However, you can install Ubuntu on a virtual machine, making the computer run Ubuntu inside an emulator in Windows. This makes it possible to run Ubuntu while you are logged into Windows. I do not recommend it, though. Ubuntu users and Windows users are in different operating systems, so you cannot just switch between them like you can in Windows accounts.
Yes, Windows 7 will overwrite the partition used by Ubuntu. In dual-booting, were two operating systems share the hard-drive (in separate partitions), you have a choice of either OS on boot-up. The recommended method is to install Windows first, then Ubuntu. Otherwise, if Windows is installed second it greedily takes over automatically at boot-up.
Ubuntu is an operating system and it is an open source software. This software could be installed on many devices including laptops, smartphones and tablets.
If you have installed ubuntu with windows you uninstall it in the add remove programs.
Wubi can only be used to install Ubuntu. (It stands for Windows-based Ubuntu Installer).
You need to have installed an operating system: examples being open source Ubuntu, Microsoft Windows, etc. otherwise you can't use the computer.