your question is confusing......
since you have had cakewalk fx and sonitus plugins forever, you didn't install them, and they are 32 bit?
but you installed a 64 bit version......of what?
and now X3a is not seeing something....... you didn't install?
do you have a 64 bit or 32 bit computer?
more specs on your pc please?
p.s. you should finish your install up to X3e..