1.5.2 problems

Hi
I ve to change my hard drive recently (yesterday) and therefor redownload minecraft but cant play ic² on 1.5.2

i ve tried to use my old files for 1.5.2 but mcforge tells me "fatal mistake"
i tried with 1.4.5 it worked perfectly...
but i d rather have 1.5.2...

i ve tried recreating a 1.5.2.jar but for some reason nothing happens
i dont really remember how i created it the first time (actual brain injury occured for me this summer, i forgot a ton of things...)

could someone please help me? just precise guidelines to what i have to do (the old guide is useless...) and what the fuck do i have to do with the api files?

thank you

ps: i used to be ngc4594 but i forgot my password and the forums setup to help recreate a password sucks, 5 tries and i get error messages everysingle time

i tried using the one given in the link on the top of the forum page
weirdly adding mcforge into the .jar didnt do anything

am i missing something?

i tried installing the 1.6.4 experimental
installling mcforge into the jar file, but once again nothing happens (no little fml window as before when i start minecraft and no mod)

thank you for your help everyone
it works on 1.6.4

is there anywhere where i can find help and tips about the new resources and machines? i found lead, but dont know what to with it^^