Ladies and gentlmen now k-lite codec packs are available FREE! (i obtained an older version via 7 dollars worth of sms codes = =")
So please visit this site!
Click me -blows kiss-Now ill explain it so you dont need to read as much.
The best way to go is the top 2 packages, unless you know what you want go get w.e. neh
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K-Lite Mega Codec Pack 3.9.0 -> apprx 17 Mibs
K-Lite Codec Pack 3.9.0 Full -> apprx 13 Mibs
The above two includes things which allow you to watch extensions from .mkv .ogm all the way to .rmvb, just follow prompts edit settings as you see fit, but usally all this doesnt really require much changing from the default (unless of course your "pro" and know what ya doinks)
I highly reccomend it for everyone! sharing the love is the best! (flames in eyes)