My video wont play in facebook on my pc but i can hear it

See this page on requirements
System requirements
Adobe Flash Player and Internet Explorer will work on Windows 7.
Links on this page to download the software required (free).

You need to make sure you have the flash player installed. You can find it on the official download page at adobe.com (search for flash).
There you can re-install it, because it sounds like your flash is corrupted.
Do you have any issue playing vidoes anywhere else on the internet?

I don't know very much about Facebook or the phone you are using but try this . Go into Facebook and click on the video you want to delete then find options and see if you can delete it from there or you could try pressing menu . Go into settings and more find apps manager and scroll down to Facebook and uninstall .then reinstall .the videos should have gone if not have you got a PC . If so go into Facebook account on your PC and try and delete the videos from there

You don't have it set to play. Go back into your setup/dashboard and set the video to play when clicked, or set it to play automatically once page is opened.

that might be that your browser doesn't has a plugin for playing video on it,you need to install adobe flash player to play video on internet browser you can download it here
http://www.adobe.com/support/flashplayer/downloads.html
remember to restart your browser after installing flash player
please let me know if it's working or not and thanks for using fixya

install latest flash player . also update your browser. you can download latest from this site. click here

That player is only for playing flash videos in the browser. If you want to play videos from your pc then you will need a media player that is capable of that. Install and use VLC
http://www.videolan.org/vlc/

Here's a link from Microsoft that should help:

http://support.microsoft.com/kb/948481

has a auto fix that could possibly work. Let me know.