Windows boot up error

Hello, helpssssssssssssssss



when i put in my windows 7 disc to boot it off
that it boots to a walpaper and a mouse on screen ,,,,,,,,,,no icons and pretends to respond if u put a disc in
when i boot normal mode into my windows XP the main os it just turns black and displays a mouse it has 2 memory block things one is just for storage other is for the os
it has a totalof 80 gb of storage when i try using my windows XP recovery disc it just says eror
click something to cancel
its a gaming pc from2001 its powered by so-yo sy- p41 firedragon mother board that has a turbo mode on it i relaced original graphics card and put some two sticks of crapy ram in it .its a goood pc? should ii take the main memory block to a place to get manually user info put in? as soon as the problem apear the computer automatically disabled the main usbs