You must not have installed the mods correctly
Try it again. Delete the .jar, reopen Minecraft, it'll redownload a vanilla .jar. Then do the exact same thing.
Have you installed ModLoader and/or deleted the META-INF folder in the minecraft.jar.
No unless you have an corrupted file
The next time you play Minecraft, if you are connected to the internet, Minecraft will automatically download it.
Assuming you deleted it locally, you should find it in your recycle bin.
To wear your skin in Minecraft first go to Minecraft.net. Then log in and go to your profile. There is an upload skin area, select your skin from your computer and then click upload. Assuming it is a legitimate skin, your player's skin will be changed.
Depending on what you mean by "lose" your world it could be corrupted or not installed properly and you might have just acedently deleted it but if you did any of those thing I am sorry to tell you but think you will not be able to get it back.
Do options--> force update, then start the game.
imesh account never deleted.....you can changed or deleted your name or personal id or ......
imesh account never deleted.....you can changed or deleted your name or personal id or ......
No. you pay oncee and you have it forever until deleted.
No, Minecraft is already in Beta, and save files will not and aren't being deleted. I have a file from Alpha that is not deleted. :)If you have a Alpha file in Beta mode, you will still receive the Beta updates.Thank you for asking,Peace,LegendThanks Legend!This question was asked back in early alpha, please don't answer it anymore!