Greeting All, your friendly neighborhood Bartender needs some advice...

I have an old Dell Inspiron 530
With 4Gb of ram and a 1 TB Hard drive
And an NVidia graphics card.

I would like to upgrade the mother board to a 64 Bit system
To add some processing power and alow me to upgrade inthe future...
Funds right now prevent me from buying/ build a whole new system.

Is this a feasible option or would I be better suited to bide my time
Till I can upgrade the whole system?

I'm at w*** right now but can provide more specs for my system
If need be when I get home today.

Any help you can provide would be awesome.