Beta 1.4 Help!!!

Buy the game. We do not help with pirated copies.

I don't have a bought account. But I moved my save folder to a flash drive. Got the bin folder from a free browser version of Minecraft. Then put then save folder in for the new files. So I have beta 1.4 and my old worlds now

Requesting Lock

All of your saves are stored in a separate folder. The bin folder holds all of the game files that minecraft uses to run the game. If you delete them, the game client should re-download them as long as you have a valid login. After the game re-downloads the files, the world saves should be fine.

Great did I just screw up my game All that work lost....

Well I redownloaded it and now when I try to play it says not downloaded

no wont lose your saves or anything, just any mods you have installed (which would be outdated anyway)
When you reload minecraft it will redownload it all for you. XD

Already tried re-installing it. But if I delete the bin folder will I lose all my stuff?

Delete your bin folder in .minecraft.

Re-download/install Minecraft. That's probably the easiest way.