I am currently running Windows 8 in my PC on 32 bit artitechture..
my question was that. it is possible to upgrade it to 64 bit artitechture
and to Windows 10 based OS. or they are all hardware build-in related issues ?

You can upgrade it but the performance may not be as great
if the basic requirements meet the minimum standards for Windows 10, them you are good to go.

The truth is that you cant put a 64bit on a 32bit system
most people running are 32bit system are not well educated about this
most systems been produce are 64bits but are running 32bit arch on their system because they believe 32bit will run faster than on it which is a lie
now heres the gist get a bit checker software on your system to confirm if your system is 32bit you can also manually do this by checking pc information on my pc.... ......if you see 32bit running and 64 or 32x64 meaning your pc is 64 bIT BUT RUNNING 32Bit
but if you see 32x32 meaning its a 32bit system and as such cant run 64bit
now to install 64bit you need to completely format hard drive and start fresh installation you cant just upgrade to 64bit using the installation method (keep files) as it will not be allowed.