Someone please tell me what to do! i had firefox exactly how i wanted it?

and then found that there was newer versions...i THINK i had 3.5 or 3.6 i dont know, anyhow, i have uninstalled and installed and all sorts of crap trying to get it back cuz i dont like any others and i can't find what i had or make the others work like the one i had...help me! someone with great computer and browser knowledge will know this so guys please tell me what you think! i had the menu you could rearrange and speed dials, etc. and i have windows 7 and my explorer said i have a 64 bit system whatever that means... i appreciate it SO much for any good answers!! jen