Before you do anything I would strongly recommend you back up your Windows installation just incase. Nothing went wrong when I first installed Ubuntu, but better to be safe than sorry!
Here’s how to do it
1) Go to http://wubi-installer.org/ – the home of Wubi, the Ubuntu installer. Run Wubi!

If you’ve got the space on your hard drive, go for 30gb or more for the installation size.
2) Now configure your installation using the simple settings options. You can specify the location of the Ubuntu installation on your Windows partition, the size of the Ubuntu installation, the Ubuntu flavour (Ubuntu, Kubuntu, Xubuntu, etc), your preferred language, and a username and password for the Ubuntu system.
When you click install, you’ll see this screen:

As soon as the files have finished downloading, you’ll see this:

3) That’s it! Click reboot now, and select “Ubuntu” on the startup screen
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Wubi sure give an easy way for windows addict to try something new easily.
Cheers to linux!!!.
I installed everything ubuntu exactly like the picture that posted above but after rebooted my computer i dont see ubuntu it just takes me directly to vista os. Anything i have to or did i make a mistake in my installation?
Hi
Does this installation need an active internet connection. If yes then what’s the need of a Installation Cd when its downloading ubuntu.
hi! is there any way to increase the size after having installed ubuntu using wubi???
Ubuntu installer takes lot of time to intall in my LP (OP vista) about 100hrs ,can u please give me suggestion for decrease this time.