Thanks, I was thinking they represent the same wallet. Can I delete the old one without affecting the new one?
Yes but always keep many backups of the seed in a safe place. There is a very small probability that the wallet file gets corrupted (bad harddisk sector, malware, technical stuff), so the seed is the only thing with which you can restore the wallet later.
Technically the seed is the only thing you need, but just for the sake of security, an encrypted wallet file is more easy to handle so you should have copies of that too.
You can put the encrypted wallet on a USB and write the seed down to a paper and hide it well, but dont lose it.
Just make sure your PC is safe and clean when you work with your money.