All Intel® processors are capable of handling a 64 bit instruction or operating system. Sometimes happens that OEMs or computer manufacturers decide to create 32 bit drivers only for their units and not 64 bit drivers.
I recommend you to check with the computer manufacturer if the unit is capable of handling 64 bit operating systems but I can assure you that all Intel® processors are capable of this.
D2550 is a full 64 bit CPU. But it still has 64-bit driver support issue. Not sure why Intel has not come up with all the 64-bit drivers...