my HD suddently make a loud "glass scratching like" sound for about 10 sec... The comp is hanged at the moment. After the sound stopped, computer started moving again.. Later on problems like PFN list corrupt and suddently reboot , or keep rebooting(fail to enter the window) happen until i shut it down for a moment... and start again... My hd is seagate 200gb barracuda..
Is this the sign of death ?

also if i recall, the sound started as i install Rivatuner while doing some program running at the background.. it only happen once...