I have a 5-7 year old Windows Vista computer, recently it has been freezing up on the welcome screen. I have tried to start it up in "Safe Mode" with no luck. It always freezes up on "Loaded: \Windows\system32\drivers\crcdisk.sys". I have tried to start it up on "Repair Your Computer" and on "Last Known Good Configuration" it the tries to repair a disk and it freezes. Every time it freezes I hear a continuous beep from inside the computer ( not the speakers). Any known solutions to this problem?