Well...if you have a Dell...read the Dell link. If you have a HP system...read the HP link.
If you have neither...find out who makes your hard drive...and then consult the appropriate link for either Western Digital or Seagate. If someone other than those two makes your drive...post back the manufacturer.
You can see the manufacturer data by going into Device Manager (Start/Run...type devmgmt.msc and hit Enter) and then clicking on the detail under Disk Drives.
The diagnostics provided by system manufacturers are only for their systems. Ditto for hard drive manufacturers, although you could try them on drives made by someone else.
Asus isn't great when it comes to support, IMO...but you may be interested in http://support.asus.com/Troubleshooting/detail.aspx?SLanguage=en&m=X5DIJ&p=3&s=193&os=&hashedid=182DU0ckwA9Jgris&no=1775 .