I can't watch Youtube videos on Safari or Flash videos.?

I recently started using the Safari web browser on my Windows XP computer to see if I would like it because I'm planning to get a Mac Book for college in a few weeks.

I went on youtube and there was a small cube with question marks around the side where the video should have been. Then I tried watching several other youtube videos and the same cube appeared.

I also can't watch videos on Facebook or any other site that has flash videos because it says I need to download the latest version of Adobe Flash Player. When I attempt to download Flash player it says:

"Windows found that this file is potentially harmful. To help protect your computer, Windows has blocked access to this file."
 
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