hardware/systemconfig recovery

how come my computer seems to be on its own, first i could not scroll up or down, next thing the mouse just goes anywhere and i can't turn my pc off so i press the power button to reboot. what happens is that at the start up windows will tell me about some hardware/system configuration recovery and when i'm finally in, my connection would shut off and i need to set up network connections again. please help me, the first time i encountered it i had my hard disk reformatted but i'm experiencing the problem again.