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Welcome to Justanswer.com, my name is Dustin.I'm sorry to hear about the issue you are having, I will do my best to help you resolve it.
To get started, I need to know what type of computer you are using, a Windows XP, Vista, Windows 7, Windows 8, or Windows 10?
Also, when is the last time you remember the touchscreen worked?
And do you know the full model # of the Asus itself?