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When PuTTY 0.78 or 0.79 is installed on Windows using the MSI installer package, the tools can't automatically find their help file: for example, the 'Help' button in the GUI configuration box is missing.
This was caused by a registry permissions mistake. The MSI installs
a registry entry to tell the tools where to find the installed copy of
the help file. That registry entry is installed systemwide in
HKEY_LOCAL_MACHINE, which means that normal users have
read-only access to it. But a refactoring of PuTTY's registry access
routines introduced a bug in which the tools would try to open that
key for read-write access (even though they only planned to read from
it afterwards), so the attempt would fail, and the tool wouldn't be
able to read the help file pathname.
The help file putty.chm is present in the install
directory, and you can open it by hand if you look for it there. The
only problem is that the tools don't offer a convenient button to open
it.
This also didn't affect the standalone version of
putty.exe that you can download from the website by
itself. That contains its own help file in a data resource, so it
doesn't depend on that registry entry anyway.