I removed the hard drive, put a jumper in to make it a slave drive and connected it to my PC. I booted the PC and the drive showed up as an additional hard drive.
I then scanned the drive and was not surprised when a Trojan was found. I quarantined the file.
I then removed all the files I needed to and reinstalled the drive to my mothers PC. I am going to reinstall Windows and start clean.
Thanks again for your help.