J720 install errors - help please

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i have purchased numbers of software and have tried to install them on
my hp jornada 720.  several of the programs installed properly, but on
the rest, i get an error message when i try to execute the programs"
cannot find application (or one of its components). make sure path is
correct and required libraries are available".  this happens a lot,
even though the executable is installed in the default directory.  Can
anyone tell me what I may be overlooking or how to locate these
missing components.  TIA

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