The Umax USC 5800 is a classic flatbed scanner known for its reliability in its prime. However, users attempting to run this legacy device on Windows 7 64-bit face a significant challenge: Umax never officially released 64-bit drivers for this model.

Conclusion

Where to Download Safely

VueScan: Only from hamrick.com
Original Umax XP drivers (for VM use): driverguide.com (look for “Umax USC 5800 Windows XP driver” – check SHA1 hash with VirusTotal)
Windows XP Mode: Microsoft Download Center (may need an MSDN account today, but mirrors exist on archive.org)

Pros: No hunting for unsigned drivers, supports RAW scanning, better color correction.
Cons: The paid version costs around $40-$90, but the free trial lets you test if your scanner works.