What version of MQ are you using and what platform are you on? On Windows there is still a 32bit client as part of the same install as the 64bit client. I don't think you can install one without the other.
EDIT: Oops - I see that the title of your question said Windows, so I guess I have answered for the platform you need.
Cheers,
Morag
------------------------------
Morag Hughson
MQ Technical Education Specialist
MQGem Software Limited
Website:
https://www.mqgem.com------------------------------