Copied from Jetscat: Download a clean Minecraft 1.2.5 Jar file Type %appdata% into the start menu Open .minecraft folder Open the bin folder Delete the current Minecraft.jar file Paste in the Minecraft 1.2.5 jar file Done You will need to find a clean 1.2.5 jar file on the net, it shouldn't bee too hard. There was also a link going around to a reset website/forum post where you could basically un-patch MC but I don't have it handy. RagMan