maxed-out,
That CPU is 64-bit.
However, it appears that the motherboard is limited to a maximum of 2GB RAM. It's got 2 slots, and it appears that it only supports up to 1GB modules, DDR2. It's possible that a BIOS update may allow larger RAM modules.
It will run Win 7, x64, but it will be hamstrung by the lack of RAM - 4GB makes it a lot faster.
You will need to go to the Packard Bell website to see if there are Win 7 drivers (and possibly a BIOS update) available for your particular model.
SD