Windows 10 blocks unsigned drivers (which Xprog 555 uses). You must temporarily disable this.
Original Xprog software uses unsigned drivers from 2010-2012. Windows 10, by default, blocks these drivers. Even if you bypass that, Windows 10’s power management aggressively suspends USB ports, killing the programmer’s connection mid-flash. how to install xprog 555 on windows 10 better
Once installed, a "better" install also means you configure the software for your workload. Windows 10 blocks unsigned drivers (which Xprog 555 uses)