I downloaded the bat client yesterday and everything w as working fine, even this morning when i clicked it it worked, but now it wont open i click on the batclient, it loads java then does nothing else, i have tried reinstalling both java and redownloading the game but nothing seems to work, any ideas?

Try deleting the batclient folder from your machine, and then download again. it's not a perfect solution but it should resolve your issue.