I used one of my buddies accounts to play minecraft because the registration servers were overloaded. When i used this account with the client it worked as should and i could use hacks. Today i was able to create my own account and i bought Alpha on it, then i downloaded the Alpha client.

Now whenever i try to run the World of Minecraft client i can't use hacks, doesn't matter what account i use. The hacks work fine on Single Player, just not on Multi Player. I checked the log in cmd and the only thing that seems weird is WARNING: Found unknown Windows version: Windows Vista. Im unsure if this message was there before i purchased Alpha however. I tried to run as admin and that didnt work. I dont get any errors other than that Warning.

As far as i could tell this problem relates to purchasing Alpha, or the Alpha client.

Help would be appreciated