Can't get java to run any thing

[jray]

Hello I've recently built a new pc for my self and wanted to play Minecraft and I wanted test my pc with a texter pack and shaders. So I download optifine and run it, it doesn't work so i try forge and it doesn't work. That when it dons on me i forgot java so fumbling trying to figure out how to set the file to java, I end up seting it to windows media player (yeah i have no clue how i did that) so i stop and looked it up and had a few places telling me to find the java file and set forge and that stuff to open with "Java(TM) platform SE binary" and i find the java file and set to that and with high hopes i click forge, and nothing command prompt pops up for less then a sec and then close and the same thing happened with optifine so I'm at a complete loss at how to fix this, I cant find any thing about how to fix it. thank you

[jray]

so sorry if messed up any rules I'm at my wits end and just posted with out fully thinking, when i should have read the rules and made a proper post.