Will windows 7 run good (without lag) like xp runs good on this sytem?

Upgrade the RAM but I think it will lag install win.7 in different drive. And check it better you just use the XP if it works well even if microsoft doesn't support.

Your display memory and RAM are too low to play a high end game like call of duty 4 effectively. There'll be a lot of lag.

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.