Webster

it looks to me like you are at the bare minimum edge of your system memory just to run sh4.

i suspect you simply ran out of memory and the computer is freezing because it cant load the data to finish.

i'm sure you already know you need a new system and i think you have run out of time waiting. adding more memory will help if you can get it free or near free, but i wouldnt spend any new money unless its to upgrade the mobo and processor along with minimum 2gb ram

for now anyway delete everything you dont need and transfer all your data files to a thumb drive to free up space on your computer then try the game again. if that doesnt work then delete the sh4 folder in your "my documents" to get rid of any saved games data.