Open your registry and find the key below. 

Create a new string value named 'LiveScrolling', or modify the existing value, to equal '1' for live scrolling enabled or '0' for disabled. Close the registry and restart Word. 

Key:[HKEY_CURRENT_USER\Software\Microsoft\Office\8.0\Word\Options]
Value Name: LiveScrolling
Data Type: REG_SZ
Data:(0 = disabled, 1 = enabled)

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