OK, lets see...
What are u using to go on internet? Internet explorer? Something else?
Anyway, go to and run speed test of your line http://speedtest.net/ so u can see that
u are getting enough juice
and try to use Firefox or Google chrome(both are better and lihgt weighton system
and faster than Internet explorer)
Broadband means nothing if u have less than 5MB/s line and want to watch online videos.
If that's what u have, don't play videos higher than 480P.
And for the player, use VLC http://www.videolan.org/vlc/ as suggested by mcnumpty23,
it plays 99% of video files u have and it comes with all the codec's for AVI, MP4, MKV, RM,
M4V, VOB and others like DVD's, MT2S, WMP, MP3, MOV and more than u need. I don't
even have installed WMP on my PC. VLC for all. If u have some file that starts with win.
media player, stop it and right click on the video and select open with... and select Choose
default program and than left click on VLC tab and check always use selected program.