So I had an error 0xC1900101 - 0x20004 when I was trying to upgrade from win 8.1 x64 to win 10 on my laptop. I did clean install of windows 8.1 and tried to upgrade to windows 10 again. And I still got the same error. In setupact.log i found this text:
FatalError [0x090001] PANTHR Exception (code 0xC0000005: ACCESS_VIOLATION) occurred at 0x00007FFF2B25EBDC in C:\$WINDOWS.~BT\Sources\SetupPlatform.dll (+000000000027EBDC). Minidump attached (60570 bytes).
This workarounds didn't help me.
Note*: Instead of removing SATA DVD drive I used these commands
Can somebody help me? Sorry for bad English.