Java 64 fails when using Launcher
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This was for resolving issues with Java installs a long time ago and should never be done with current (Java 8+) Java.
Open a Command Prompt as Administrator.
CD into your C:\Windows\SysWOW64 directory.
Check for any java executables there. There shouldn't be any since the launcher isn't working.
Then type in:
mklink java.exe ..\system32\java.exe
mklink javaw.exe ..\system32\javaw.exe
mklink javaws.exe ..\system32\javaws.exe
And try the Launcher again.