Your computer's older interface will limit all USB 2 devices to USB 1.1 or older performance standards, including throughput and speed. If this is a laptop, upgrade to a modern PC. If a desktop, maybe an interface card can add USB 2.0 compatibility. But you still would run into bottlenecks in the motherboard's architecture. These considerations can result in data loss during transfers, especially of large amounts of data.
Bottom line: A PC as old as 4 years is due for an upgrade. Not just for USB reasons.