Click on the Windows Icon on the lower left of your screen. The windows icon looks like this or similar:
After you click on it, type in system information as shown below and press enter:
A screen similar to the one below will appear and the processor/date as well as your memory is listed as shown below:
How to determine if your computer is 64-bit or 32-bit
On the system information screen, look for System Type
x64-based PC means 64-bit, otherwise it is a 32-bit system.