If your new computer is a tower with a mount for a second drive, just remove the hard drive from your old computer and install it in the new computer as a second drive. Then you'll have access to all of your original files. If the new computer doesn't have this capability, purchase an inexpensive USB SATA controller, remove the hard drive and connect it to the controller. Plug in the USB cable and then you can copy all of your files from the old drive to the new one. If you miss some files, no problem as you can always just plug in the controller and access the files on the old drive. As an IT tech, I've done this many times to transfer files between systems.