Hm, I'm not exactly sure what I could tell you that would be of an assistance. When I upload videos from Youtube or somewhere else and then view them, they always run so I'm not sure how to address your problem because it's not one that I am familiar with.
It sounds like it maybe a technical problem of sorts and I'm not really good with those. In fact, I run to others when I'm having technical problems (though I really need to learn how to resolve these issues on my own).
If you uploaded the latest version of Adobe then you should be able to view videos online. Yet, you say that your PC is still asking you to add Adobe even though you already have it. That's a little odd. It sounds as if something is off.
Maybe there is someone on here that could be of assistance or perhaps you know someone personally who has a better understanding of PC technical problems that could be of assistance in resolving your issue.
Sorry I couldn't be of more assistance but I hope things work out for you.
Joseph, Welcome to the FF Nation. I am glad you dropped in to join the group. Dont be shy. There is lots to do, read and be involved with. Your participation and involvement is important to us all. Takes a bit to kinda figure it all out but you will be glad you did. Have fun and look around.