Istall this first:
Chem4Word v1.5
Instruction: Unzip to a temp folder. Run the Setup.exe file. When asked, select install for this user only.
Then install this one:
Chem4Word.Setup.2.0.1.0.Beta.11
Instruction: Run the .msi file in the ZIP. When asked, select install for this user only.
Open word, do not install update offered as v3 does not work on Word 2007