Program Installation problems

I've got a new system with Windows XP 64 bit.
I was able to install many programs I need.
I'm working on an old VB6 project which uses several pretty old third party
controls.
I installed 2 Sheridan ActiveX controls with no problem, but another 2 with
the same age from the same Sheridan say "Setup.exe is valid, but for a
different system".
The company Sheridan is not alive, the project is too big to be modified.
Is there any trick or work around to install those obsolete ActiveX controls
on 64bit?

Thank you

vovan