last night i tried to get onto my computer so i could run a defragment while i did some homework, but when i turn it on, it shows the first little startup up screen with the name and brand of computer then it goes immediatley to a black DOS like screen with a "key" shape in the upper left hand corner. i type things and i found out there is a 7 character limit on the password you can enter and after three tries, it says "Incorrect Password. System Halted." or something to that effect. i have no idea why it suddenly did this... so can anyone help me out?