everyone STFU and calm down. if it doesnt work bitching about it wont help any. try searching through some of the threads in here and find some of the java things you need to update to use the other clients and then download em(helped me on my dads computer). then download winrar(google it), download the .exe of the client(first page) extract it with winrar, open it then open the .exe. if it load then you just type in a username and server IP. it should look like:
username:imamoron
password:
server ip:127.0.0.1
but with a diff name and server ip. if it says that JET has expired then just set your system clock back so it says its the first of the month and it wil work fine