Q: Does mac mini support windows 64 bit when using Boot Camp?

I used my own ms official windows install disc

if the mac mini support windows 64 bit depend on if the mac mini has a 64bit cpu

and the age of the mac mini depend on if it support windows 7 or 8 or 8.1

if you installed it in a virtual machine like virtual box non of those things would matter but you would not be able to play fancy 3d games

Check the output of the following Terminal command

sysctl hw.cpu64bit_capable

hw.cpu64bit_capable: 1

The version of BC software will also determine what you can and cannot install.

Please also see Boot Camp: System requirements for Microsoft Windows operating systems - Apple Support.