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You can do a factory reset on your laptop, bringing your computer back to however it was when it was brand new. If it came with Windows 8.1, then this will be an easy and very effective way to install Windows 8.1 on your laptop. Your hard drive will be wiped clean in the process, so be sure to back up any data before doing it.
If you install Classic Shell in Windows 8.1, you can configure it to make Windows 8.1 look and feel exactly like Windows 7. That would be an easy way for you to get a Windows 7 like system on your computer.
Here's how to do a factory reset:
https://us.answers.acer.com/app/answ...ail/a_id/34866