I currently have a old gateway PC 1.5Ghz pentium 4, 256mb ram, and a Nvidia Fx 5500XT 256mb Gfx card, and my sister also uses it and she screws it to hell with trojans etc. i was wondering if it is possible to hook up 2 hard drives and have them interchangeable.. 1 for me. 1 for her. and not have stuff cross over etc. and i would like to make it faster.. 1gb ram a new processor and i was wondering if i should get a new motherboard or just stick with stocker.. i want it for games.. the gmaes i play are.. Sims, Sims 2, Battlefield 1942 and mods, Flight simulator 2004, And Command And Conquer games.. Thanks for all the help!