Strictly requires 64-bit drivers. Because UMAX never manufactured a 64-bit driver for the 4100, standard installation packages will fail on a 64-bit OS.
If the scanner works, but the physical button on the front does not, use the VueScan software, which offers better compatibility with legacy UMAX scanners. install umax astra 4100 scanner windows 7
Method 1: Using Compatibility Mode (Best for Windows 7 32-bit) Strictly requires 64-bit drivers