Kubuntu installation error in Windows 7

Good day everyone,

I am an absolute newbie when it comes to using Kubuntu, so I'd really appreciate it if anyone could help me with this installation problem that I've been experiencing.

I have been using Ubuntu for a long time now, and I figured that I should check out what Kubuntu has to offer, too.

Thus, I decided to install Kubuntu on my Windows 7 machine, but upon rebooting my computer, the screen froze.

So, I had to switch it off, restart all over again, and key in Kubuntu, but what I saw instead was a screen full of dots.

Since this is the first time that I've seen something like that, I decided to uninstall Kubuntu, but I cannot find any uninstall option in the Control Panel.

Does anybody know what's happening to my computer? How will I be able to uninstall Kubuntu at this point?

Thanks to everyone who will be helping me out! Cheers.