Read again very carefully... he did answer your question:
My question is do I have to upgrade to a windows 64 compatible o/s now? in order to boot this new hardware?
You can still use 32-bit software on 64-bit capable systems.
That means any version of Windows (other than for IA-64) can be installed on that system... 32-bit or 64-bit... it doesn't make a difference in terms of installing the OS. The only problem you might find is with 64-bit drivers for your hardware. Ensure that all your hardware has 64-bit drivers available before you make the leap to 64-bit.