Other Answers (7) Look at your system properties in the control panel if it is a windows machine. It will tell you if the operating system is 32 or 64 bit. It will also tell you what processor you have. If it isn't immediately obvious by the name that the processor is 32 or 64 bit, you can google the processor name and find out. If you are trying to decide whether to install a 32 or 64 bit OS, install the 32. The device drivers for the 64 bit aren't always available, especially in laptops.