Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Worthless in my situation

I lost everything on my desktop, which is to say 90 percent of the information I had stored on my 3-month-old iMac G5.It happened when I tried to open a file on the desktop by double clicking on it. Everything on the desktop except the hard drive icon just disappeared.An hour on the phone with an Apple tech proved fruitless. He recommended Data Rescue.I downloaded the demo version, ran it, and came up with nothing. Nevertheless, I ordered the software (from Amazon).I tried it again, this time making the scans after starting up from the disk. I tried the "Thorough Scan" and the Content Scan."Each scan took 30-45 minutes to perform and turned up nothing. Oddly enough, when the scans were complete my screen looked as if I had never done them. There was not even a report saying nothing was found.I guess Data Rescue works well in many situations, but it was a waste of money in my case.