Edit: Somehow I missed the previous message. Good to hear you are up and running.
Unless you want to pursue recovering files from the old drive, you can toss it in the trash.
If you had made a backup of your computer you would most likely have done that to an external USB drive using software such as Acronis True Image. This is the USB drive that they are talking about.
Install the new hard drive. Boot the computer using the recovery disk. You may have to manually select the boot device when powering the computer. This is typically done by pressing the F12 key during power-up. Then follow the prompts. This will install Windows on the new drive. Once Windows is installed you then install the drivers from the driver disk.
