i need help plz it dont work

ok this is what happened i installed it everyway i could the first time is when i got the 1.1 version fulll then when i play i cant move or do anything and in the middle of the screen it says "Please remove colored models to play on this server" all the servers say that i cant play then i installed 1.0 then got 1.1 patch then it says in the middle you have modified your computer please remove it ANDI STILL CANT MOVE HELP MEEEE!!!!!

If you have any cheat detection running, I think that may be the cause of this. Try turning any off if you have any and then playing to see if it will work then