Starts well, then it doesn't work anymore
Today, I started reading a book I have to read for school. While painting some sentences, the Adobe Acrobat Reader DC (installed five days ago in the netbook I was given by the government) started to have problems. The tool bar which is upside the screen turned grey, and Acrobat didn't answer anymore. I pressed "Alt + F4" trying to close the program, but instead an invisible window (of the program, I assume) appeared with no text one second and dissapeared. The non-responsing PDF was still there, and I tried three more times. Every time, this invisible window came in and dissapeared in a couple of seconds. I had to press "Ctrl + Alt + Supr" and open the task manager to close the program. Then, I opened again the PDF because I was afraid of losing my notes. Some where there, but the latest didn't. I kept reading and painting, but some minutes after the program started to not answer. One more time, the upside bar was grey. One more time, the invisible window appeared and dissapeared. One more time, I had to use the computer's task manager. One more time, I lost the latest notes I've made. I tried again after ten minutes, and... surprise! It didn't work as it must do! How can you help me? I have to read PDFs every week, so...
Thank you.
NOTE: I looked for new versions in "Help", but it doesn't open anything.
