Your HD 7570 is WELL BELOW the minimum HD 7850.
http://gpuboss.com/gpus/Radeon-HD-7850-vs-Radeon-HD-7570
Your CPU is also below specs. You cannot expect at all decent performance in the game. With regard to reinstalling from hard media, the Origin registration is a one-time event, after which, you must SKIP over the proposal from the DVD to re-register.
There's a way to pause, wait some seconds, then Continue, and not have to re-enter the not-needed CD-Key number.
Minimum PC System Requirements
OS: 64-bit Windows 7 or later (Win 7 should have SP 1)
Processor (Intel): Intel i3 6300T or equivalent (3.3 GHz)
Memory: 8GB RAM
Hard Drive: At least 40 GB of free space
Graphics card (NVIDIA): nVidia GeForce GTX 660 2GB
Graphics card (ATI): ATI Radeon HD 7850 2GB
DirectX: 11.0 Compatible video card or equivalent
Online Connection Requirements: 512 KBPS or faster Internet connection