You enabled it, good. Only the first check is needed, but it doesn't hurt to install WMP, though Windows might try to change your file associations. But, I already told you, C drive only. Qt doesn't always like other drives. Works for some, doesn't for others, no rhyme or reason figured yet. There is just something about running software on non-root drives that Qt doesn't agree with, not within JONT's control. I wouldn't manually download dependencies like that. Stick to MSVC installers. It looks like you might have an x86 system and not x64. Windows must be x64, your CPU must be x64.