Hello Dave,
Please check the recommendations in the link below:
https://hansaworld-web.s3.amazonaws.com/marketing/Product%20sheets/Standard%20ERP%20infrastructure%20recommendations.pdf
We do not support certain machines/OS's anymore, the new system is most likely more demanding comparing to 6.3, as the technology is changing and we are also adjusting to it.
Upgrading to 8.0 is inevitable, why postpone it? Please consider upgrading already to 8.0 and skip 7.2.
HansaWorld Support Team