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hmmm, the only other opition i could think of would be to deactivate windows defender, sometimes it does falsely misflag things as maleware, there's a program i use called "destroy windows 10 spying"(works on windows 7 and 8 aswell) that manually deactivates windows defender, other than that it may be an issue with your internet connection being upable to connect the the Dtube servers, anyway i hope you are able to fix this issue

ok, thanks