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Can you please share a screenshot of what the Acer laptop is showing at the moment? You might need to a smart phone or camera to take this photo as the Windows seems not able to capture a screenshot itself.
Hello I am Serge and I will try my best to answer your question
You said it was stuck all day on exactly same percentage?
At this moment you should restart it. Are you doing recovery with CD/DVD by Acer?
Sometimes you do not need CD, I was just checking. Acer has a recovery partition that you can boot into and start process all over again.
Here is the video by Acer support how to access it and work it: https://www.youtube.com/watch?v=pmVT0Z9r6_Q
you are welcome