My system does not recognize my hard drive

Sadly, that could be the case ;-{

At this point I would recommend replacing your HD with a new unit and using your Windows recovery CD/DVD install a fresh copy of your OS on the new drive. Then locate a good recovery application and using a universal mSATA to USB adapter try fixing your old HD.

If the information is very important you may need to ship out your drive to a data recovery service which can fix the drive in a special clean room and then copy off your data. This is a very expensive service so make sure you don't have a backup some where which is your last hope.