X64 is a 64bit version and x86 is the 32 bit version. Odd, I know. The primary difference is that a 64 bit system can handle more memory and the programs are faster.
Now the bad news. You CANNOT run 64 bit programs on a 32 bit machine. Your system has to be a 64bit system.
The good news is that the 32 bit version will work on either system, so : When it doubt, go with the 32 bit version. Don't worry too much about the difference, unless your planing on using more that 8 gigs of memory and you run programs specifically designed for 64 bit processing (like Photoshop) you won't see any difference between 32 bit and 64 bit. Again, just go with the 32 bit version (x86) unless you know for sure that your system is a 64 bit.
I cant really gove you an answer,but what I can give you is a way to a solution, that is you have to find the anglde that you relate to or peaks your interest. A good paper is one that people get drawn into because it reaches them ln some way.As for me WW11 to me, I think of the holocaust and the effect it had on the survivors, their families and those who stood by and did nothing until it was too late.