I can't help u with psycho, that's a very good question. I haven't played MGS for a while but I think u are able to do a little bit of damage when you are playing in the first slot. Maybe after an 1 hour fight you'll win.
I can u help with the memory prob. First download this files:
http://www.aldostools.com/memoryconverter.zip.
1-Simple, open the prog.
2-click on the ... icon
3-choose the right type of file(in the drop down menu) before choosing one (IMPORTANT)
4-choose your file
5-click convert
6-choose the right type of file before converting it
7convert
EASY