Hi Samuel, a part an antivirus software, Free antivir, my system is clean. this is a piece of log, thanks in advance for helping me. C:\WINDOWS\system32\brltty -b md -d serial:com1 -l debug -n -e brltty.exe: checking for braille driver: md brltty.exe: initializing braille driver: md -> serial:com1 brltty.exe: serial device opened: com1: fd=1828 brltty.exe: Skipping probable ACK packet brltty.exe: ReadFile error 998: Accesso a posizione di memoria non valido. brltty.exe: receive_rest(): short read count brltty.exe: Invalid packet: STX 02, ETX aa brltty.exe: braille driver initialization failed: md -> serial:com1 brltty.exe: braille driver not found brltty.exe: Braille Display Dimensions: 1 row, 80 columns brltty.exe: shifts: fwin=80 hwin=40 vwin=5 brltty.exe: checking braille device: serial:com1 brltty.exe: checking for braille driver: md brltty.exe: initializing braille driver: md -> serial:com1 brltty.exe: serial device opened: com1: fd=1828 brltty.exe: Skipping probable ACK packet brltty.exe: ReadFile error 998: Accesso a posizione di memoria non valido. brltty.exe: receive_rest(): short read count brltty.exe: Invalid packet: STX 02, ETX aa brltty.exe: braille driver initialization failed: md -> serial:com1 brltty.exe: braille driver not found brltty.exe: Braille Display Dimensions: 1 row, 80 columns brltty.exe: shifts: fwin=80 hwin=40 vwin=5 C:\nvdasource\main\brltty-3.10-2\bin>
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