Photoshop loading problem

Hello everyone @ Kirupa land…I am using windows XP with PS version 7. Suddenly since today when PS is loading, it loads everything, from brushes, to tools to Initializing, when once it gets to the part of Color Preferences, everything disappears… I have restarted the computer, deleted that PS and installed a completely different PS7 but to no avail, I didn’t have the problem solved…can someone please help me with this?