Hard Drive Recovery

Alright, we had a PC go down, Monday morning. The mobo was all dusty, the PC was old, it bit the dust. I have the HD here, a 40GB Western Digital, and all the files and OS is still intact. I plug it into another computer to start transfering files off. While this is how I would normally do it.

I recently had a PC die in Indy, and it was covered under warranty so the men fixed it, and also did a HD recovery, and they somehow re-imaged the OS and all the files, and all the settings, onto this new hard drive. Does anyone know what program was used for this? How I can do this, if possible I would love to do that, while I can recover all her data, her Outlook and E-mails, will be an entirely different story.

Thanks!