I ran a test on a recently built Windows 7 Professional pc with no programming tools.
The bare minimum are:
LIBJCC.DLL, LIBJTML.DLL, LIBJUTILS.DLL, LIBSYBUNIC.DLL, NLWNSCK.DLL
PBDWE170.DLL, PBSHR170.DLL, PBUIS170.DLL, PBVM170.DLL
Plus the driver for your database connection, PBSYC170.DLL for Sybase SYC for example.
Other features like RichText might need more files. See the help as noted by someone else.