|Test the hard drive with the drive manufacturer's diagnostic software. You will need the DOS version which runs from a bootable CD which you create from the downloaded ISO file. Links are here: http://www.tacktech.com/display.cfm...|
The purpose of the test is to determine if the hard drive is starting to fail, or has already failed. You may think this highly unlikely if your Vaio is new, but it's by no means unusual for new hard drives to fail prematurely - it may have come from a bad batch for example.
If it has failed, and it's less than a year old, you are entitled to a no-cost replacement from Sony.