Convert USB 2.0 to Firewire 1394 via USB adapter
Convert USB 2.0 to Firewire 1394 via USB adapter
Back in the day, there were FireWire-to-USB adapters, but they've been around for about 15 years and are quite costly. If you manage to locate one, it might be worth a shot—they often functioned well.
You're very young to be aware of these things! Your 2009 Alienware Aurora R2 uses a 1394 port, which isn't something you'd typically need or use.
Sure, just let it be. That's one of those things that might be pricier than the old PC.