Hi Sarmad,
My name is Cindy. I am sorry you are having this problem. I know it is really frustrating. I will do my best to help you with this problem.
Please note: This is a user-to-user community forum. We are users just like you who help others. We are not employees of Microsoft.
Microsoft offers free downloads that are available free of charge. I have attached a link below on how to access this software.
https://www.microsoft.com/software-download/win...
Most computer companies have a way for you to install Windows on the computer. I have enclosed links to Acer on how to download Windows if you are having a problem.
https://community.acer.com/en/kb/articles/64-ho....
https://community.acer.com/en/kb/articles/14751...
For more detailed information, I have attached a link to the Acer support website.
https://www.acer.com/us-en/support/contact-acer
Please let me know if you have questions or problems as I am here to help.
Best Wishes,
Cindy
Note: This is a non-Microsoft website. The page appears to be providing accurate, safe information. Watch out for ads on the site that may advertise products frequently classified as a PUP (Potentially Unwanted Products). Thoroughly research any product advertised on the site before you decide to download and install it.