Go to the website of the manufacturer of your new 500 GB SATA drive, Seagate I presume from your model number. Download for free and install their software called Disk Wizard - it is a customized version of Acronis True Image. Read its manual. and it will show you how to make a clone of absolutely everything from your old drive to your new one. In doing so, be sure to pay attention to two items:
1. By default it MAY want to make your new clone the same size as you old drive. You can let it do this, and it will leave half of your new drive as Unallocated Space. You can use it later to create a second Partition on the new drive which will be treated by Windows as a whole separate drive with its own letter name. OR, as you make the clone, you can use menu options to have the clone occupy ALL of the new drive as one larger Partition.
2. This is probably default, but check that the new clone will be created in a BOOTABLE partition so that your machine can boot from it when done.
Once the cloning is done, I recommend you shut down and disconnect the old Maxtor, maybe leaving it mounted inside for now. When you reboot, go directly into the BIOS Setup screens and make sure the SATA drive you just worked on is set to be your boot device, and there is no attempt to use the old Maxtor on the IDE port for booting. Maybe the SATA drive is your second boot device, after trying an optical drive first. Save and Exit the BIOS setup and boot into Windows. After you're satisfied all is working as planned, you can decide what to do with the older Maxtor unit. In the meantime, it is a complete backup up to the point of your change-over.