Solve : computer slow to respond to keyboard?

1.	Solve : computer slow to respond to keyboard?
Answer» When using the keyboard the screen DISPLAY is late in displaying the last keystroke so that the printed message is missing letters if typing at normal speed. The computer is an ACER ASPIRE 5536 using Windows 7 Virus PROTECTION ,no viruses present Any help appreciated 1) What is new or different since the last TIME everything worked properly (ie, new hw, new sw, virus, ERROR, etc)? 2) What is Windows 7 Virus Protection? Please run full SCANS with BOTH your anti virus app and with MalwareBytes. 3) Does the same thing happen in safe mode?

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