I downloaded today and installed the 64-bit version of Ubuntu 14.04 something,and i installed it via Live CD. All went well, I created a partition of 150GB and another one of 508MB (the latter for the swap space) and when i restarted the PC it automatically booted to Ubuntu, it didnt ask for which OS to boot to.
I booted to Ubuntu alright, but noticed that it wasnt working properly - the mouse lags and leaves trails of itself, typing had a delay - and so i figured that i shouldnt have installed the 64-bit version cause i have 4GB of memory. I tried downloading the boot repair tool by typing in the terminal:
sudo add-apt-repository ppa:yannubuntu/boot-repair
but i received an error saying something like: cannot locate /cow in grub. I googled it but couldn't find anything. Then i typed:
and it did find my Win7 installation. Next time i rebooted i was prompted which OS to boot from and I chose the win7 loader. All went well and there I was at my windows. I then proceeded in formatting the disk partitions that were used by Ubuntu, but then when i rebooted there was an error on the screen saying that there is no bootable device. I rebooted and pressed F12 to access the boot options and I found 2 of them, one with the tag P0 and one P1. I tried both of them, the first one redirected me to the previous message, whereas the 2nd one redirected me to a message saying:
I had no idea what to do, so I re-installed the Ubuntu OS from the cd and ran the update-grub command again (boot-repair still didn't work). Now i get prompted each time which OS to boot, but my Ubuntu installation does not work. When I choose Ubuntu, I get a black screen with some trails of colour on the top and nothing happens from there on (I left it like that for 15 mins so I guess nothing will happen after that).
What I wish to do is delete Ubuntu and always boot Windows . Feel free to ask any details.