First of all, English is not my native tongue, so apologies for any mistakes. My computer recently started prompting that it can't launch Windows successfully. So I just choose start Windows normally. Then, I found that the startup freezes at the Windows screen (before the login prompt). I have tried rebooting several times and get the same results. So I just gave up. After few days, I tried to boot up my laptop again. This time it got to the desktop, but it's extremely slow and the icons on my Desktop don't show up. I decided to format the Windows partition and reinstall a new one. (It is usually faster that way since I kept my 400GB+ data on aother partition and programs and the rest in the same partition as Windows). The thing is I get the Windows disc at the moment (Traveling aboard). But I have a Windows 7 disc image on my hard disk. So, I downloaded Ubuntu 14.04 LTS, made a Live USB, and then try to burn the image from Ubuntu. But the program just freezes and I don't know why. I tried several times and it's still the same. So I tried using Fedora instead, just to see if it will work. The Disk Image Writer report something like this. Error unmounting /dev/dm-0: Command-line `umount "/dev/dm-0"' exited with non-zero exit status 32: umount: /: target is busy (In some cases useful info about processes that use the device is found by lsof(8) or fuser(1).) (udisks-error-quark, 14) Also, I tried installing linux on the windows partition. The installation program freezes (both Ubuntu and Fedora). So, I thought that maybe something are wrong with my hard disk. I seek the solution on the internet and found that gparted can be used to format a partition. And it also froze at "Searching /dev/sda/ partition ...". I'm using Lenovo Y570. Spec below. http://www.notebookreview.com/notebookreview/lenovo-ideapad-y570-review-a-lenovo-bestseller/3/ Can anyone suggest a next step in diagnosing and fixing this problem? Thanks in advance.