Hi, thank you for contacting JustAnswer.com. My name is Russell. I will do my best to provide the right answer to your question.
I suggest that your new computer probably needs to have the driver for your Epson WorkForce installed properly, before scanning will work properly. Since the scanner recently, previously, worked just fine (using the previous computer) there is not likely to be a hardware error, so it is likely that the problem will be set to rights by this method.
Let me know what the Windows version on your new Acer computer is, so that I can give you exact instructions on what to do, that will have maximum likelihood of success in solving the problem. Thanks.