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In Windows' Control Panel when I go to uninstall a program many do not show their size. Why does this happen and how can I change it? Even Microsoft Office doesn't show it's size which surprises me because it's a reputable program.

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The Add/Remove Programs applet first looks for the optional registry entry at HKLM\Software\Microsoft\Windows\CurrentVersion\Uninstall\*SomeProgram*\EstimatedSize.

If that key can't be found it looks in the Program Files directory for a subdirectory name sharing at least two words in common with the application's display name (stored in the mandatory registry entry HKLM\Software\Microsoft\Windows\CurrentVersion\Uninstall\*SomeProgram*\DisplayName) and reports the size of that directory.

If both of these methods fail then no size is displayed.

Further reading

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Windows 7 has dropped the file searching method. – David Marshall Mar 24 '13 at 22:55

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