old projects won't load third party vst plugins on new computer

[kukumarbob]

Hello,
I've had this problem for years (say 15) and have never figured it out. If I get a new computer, install Finale, setup third party VST instruments with Kontakt, everything works except if I try to load an old project that was created on a different computer, the VST plugins won't load.

I get two error messages:

1) Failed to load VST plug-in program data.
2) Missing requested instrument plug-in

So far my only solution has been to try not to get a new computer, but that's pretty unsustainable. Any ideas? Any help would be greatly appreciated. Thank you very much!