If you designed a processor with a 64 X 32 register file? How many KB of data can be stored in the register file?

For the register file in problem above:

a. Would you use signed 2s complement or unsigned binary notation to refer to each register with a unique number? Explain your answer.

b. How many bits are needed to access a register?

It is dealing with MIPS files and it is referring to a 64 bit by 32 bit register. All it want to know is the amount of data that can be stored in a register that large. Then the follow up questions just ask about detail.