It is very easy to know if Laptop or computer is 32 bit or 62 bit as softwares come which can be either installed on 32 bit or 62 bit computers or laptops.
Control Panel>System>You get to view whether 32 bit or 64 bit
See the below screen shot for windows 7
Why we are providing this info here because you as share traders will be installing online share trading or stock trading software's which comes as per 32 bit and 64 bit version laptops and computers.
If you have bought your laptop within the last year then it is defiantly 64 bit compatible. However you operating system (OS) (windows vista/xp) will be 32bit and so you can only run 32bit programs. If you do for some reason have a 64bit OS then you can run 32bit programs without a problem.