🚀 go-pugleaf

Almost identical situation in Windows 7 64-bit:

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run regsvr on both DLLs
- no thumbnails

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do a 'repair install' of Reader 9 from control panel > programs and features
- still no thumbnails

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run 32-bit explorer:
- thumbnails YES.
- Previews, NO. You get an error message referencing PDFPrevHndlr.dll (Explorer's preview feature has been somewhat changed and enhanced in Win7 vs. Vista, so this is not a real surprise.)

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run regular (64-bit) explorer on directories where thumbs were generated by 32-bit explorer:
- thumbnails still YES.
- Previews still NO. You get a generic message 'this file can't be previewed'

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btw: for those getting a regsvr error msg, try enclosing the whole file path in quotes, e.g.:
-- type CMD in start search
-- r-click on CMD.exe (should be top result), choose 'run as administrator'
-- this opens CMD in system folder
-- type your command and press ENTER. The whole command line will look like this:
C:\Windows\system32>regsvr32 "C:\Program Files (x86)\Adobe\Reader 9.0\Reader\PDFPrevHndlr.dll"