UMAX Astra 5800 Scanner Driver for Windows 7 64-Bit: Full Installation Guide
Be extremely cautious of websites claiming to host a "Umax Astra 5800 Windows 7 64-bit Driver." Malware Risk Umax Astra 5800 Scanner Driver For Windows 7 64 Bit -UPD-
If Windows 7 detects the scanner but cannot find a driver (marked with a yellow exclamation mark in Device Manager), you can try forcing it to use a generic Microsoft driver. UMAX Astra 5800 Scanner Driver for Windows 7
Open Device Manager: Click Start, type devmgmt.msc, and press Enter. and press Enter.