Downloading Adobe Flash Player and have some problems?

I've been visiting YouTube for the past week and there has been absolutely no problems. Then today, I can't watch any videos because it says I need to download Adobe Flash Player. I downloaded it and I still was unable to watch any YouTube videos. Also, since downloading it, I frequently got pop-up... mostrar mais I've been visiting YouTube for the past week and there has been absolutely no problems. Then today, I can't watch any videos because it says I need to download Adobe Flash Player. I downloaded it and I still was unable to watch any YouTube videos.
Also, since downloading it, I frequently got pop-up errors, regardless of the kind of site I was visiting, that look like this:

getPlus+(R): Error
Operating system error! (a number that I don't think I should tell you cause it might be my IP)

So, what I did was uninstall it. I decided to reinstall, but it wont let me and I keep getting the same error message.

Mozilla v.3.5
I'm using a PC not a Mac.

Any advice?
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