I have downloaded Minecraft, but sadly don't have an account. I have tried to install Optifine for 1.5.1. I don't know how I can uninstall it without deleting minecraft from my computer. But the last time I did that, I went to a site where I could play Minecraft for free. It redownloaded all of my files into the latest version from 1.4.7 to 1.5.1! Should I do this again?