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Umm... Install java maybe? www.java.com
It got erased when you deleted your old os
I'ved Installed java in my pc still says when i open them :Enable to lauch application
Try google the error code it gives you. This isn't exactly the forums for it anyway.
We're a pokemon community, I'm sure the java community knows much more than we do
I use meboy-f sometimes, but if u want to play Pokemon .gb .gbc games, just use the emulator u want,you dont have to put java on it,and another thing Windows 7 doesnt support java as of now,not sured..