Yesterday I've tried to install Ubuntu on my windows 7 desktop pc. I've burned the iso on a dvd, and installed the help boot. Then it asked to reboot, after that it took me to the ubuntu purple screen and it went smooth, I could try the features of ubuntu, entered Mozilla and everything. But when I put install Ubuntu 13.10 (inside of Ubuntu interface), guided me through the steps. But since I couldn't see the guided installation on the ubuntu website, I forgot to check 'install third party apps' or something like that. So when I finally put 'Install', an error message pop up "Error informing the kernel about modifications to partition /dev/sda2 - Device or resource busy. This means that Linux won't know about any changes you made to /dev/sda2 until you reboot - so you shouldn't mount it or use it in any way before rebooting" I tried to click Ignore, cancel, close it. But it did nothing, behind this message, was the location map. The rest of the ubuntu interface worked just fine, except I couldn't go back to windows or close that error message. So I rebooted, after the startup screen (not the windows one), it went black screen with flashing/intermitent white dash. Just that. I can't do anything else in there but rebooting. I'm new in all of this and I'm starting to regret installing ubuntu at all. From what I've tried, I can access BIOS, but then I'm completely lost.
Please help me T.T I would just like to go back to windows if the ubuntu fix it's too complicated u.u