Is it possible to install multiple Operating systems on one PC ? If so, how many can I have on one PC ?
Yes
Install windows systems in order of release
Then shrink the C: partition using disk manager and install the non-Windows OS's in the free space.
But will need a separate license for each install of Windows.
Much easier and safer to use VirtualBox etc. and install virtual machines. Then the question is how many can you have running at the same time on one PC.