If you have an older computer, many times the software that came installed for CD / DVD burning doesn't work any more. Maybe never worked all that great on day one. You will get error message after it is so far out of date.
You can get a freebie copy of a burner. I use Infa Recorder. Can get a copy here.
InfraRecorder » Welcome
This is simple to use and understand, does many things well.
As mentioned, storing data on CD's is not that reliable longer term. A better option is to buy an external hard drive. Partition it into virtual drives to both back up your Drive C OS and store all your critical data.
Many folks only have the one physical hard drive in their computer. Risky in a number of ways. If it fails you can lose both your OS and any data.
The better method is partition the Drive C into a drive for the OS and use any other partitions for data. That way if you have to reload the OS, will not lose the data. With that method and a complete backup on another physical hard drive like an external one, you have a very secure method of storing data. Data is in two physical spots, the external drives usually are not even turned on or spinning unless in needed use. They get far less wear and tear than a normal computer drive.
From those sources you can make many CD copy version for daily use or to give away. Infa Recorder does have an ability to make cloned CD copies. I think you probably need two physical CD / DVD drives in the computer. I've never used that function.
Use this opportunity to think about back ups in general. Both for your data and your OS. It is horrible if your hard drive crashes and nothing is backed up.