These are some typical sounds heard from bad Hard Drives in a data recovery lab. If your hard drive makes noises like these and you are still able to access your files - backup immediately as recommended above by optoma...
http://www.datacent.com/hard_drive_sounds.php
At this point, if your atapi.sys file is clean from malware and considering that you also got an ntfs.sys error, together with the noises you are mentioning now... this is pointing to a bad hard drive or serious hard drive error. Backup now!
Bits ...
