My apologies for being less than clear...

There should be two keys under 0x0409.

The key 0x035903370 is just an encoded form of the date at which the
collection was added.  So, so you should add a new key, such as 0x03600000,
and then in that key, you should have an REG_SZ value "Filename" pointing to
the .COL, and a REG_DWORD value "Full" set to 0x00000001.

But, after additional consideration, I am less sure that this is causing the
problem of "missing examples and samples".  The suggestion to add additional
.COL files to the list of available help-collections implies that there is
such a .COL that contains the examples and samples, and it is not listed in
the collections.

So, I looked at the .COL on my system, "E:\Program Files\Microsoft
Office\ODETools\V9\MSDN\DNMOD\1033\MSDNOD9.COL", and it turns out to be an
XML file.  Within it, via notepad, I see:

 <Folder>
  <TitleString value="Code Samples"/>
  <FolderOrder value=11/>
  <Folder>
   <TitleString value="=code0x01"/>
   <FolderOrder value=1/>
   <LangId value=1033/>
  </Folder>
  ... repeats with TitleString value="=code0x02" up to "=code=0x0A" and
"FolderOrder value=2/" up to "=10/".
 </Folder>

Then, I see that there are .CHI and .CHM files with the names CODE0x01 up to
CODE0x0A, in the directory specified by "FileName".

So, now my suggestion is to examine your .COL file to see if it contains
"Code Samples" or something similar, and, if so, to verify that the
referenced "CODE0x.." files are present.  Hopefully, the files are simply
missing and need merely be located and copied to the folder pointed to by
the existing registry-key "FileName" value.