I cannot even put the files of the mod loader into my minecraft.jar file, i have done this all before and it has worked fine, but accidently deleted minecraft.jar, so I redownloaded minecraft, and when I went to put modloader back in I got this error message, when all I had running was the winrar file for minecraft.jar, and the winrar file withe the modloader classes in it.
! Cannot rename __rzi_20.565 to C:\Users\jack\AppData\Roaming\.minecraft\bin\minecraft.jar
! Cannot create C:\Users\jack\AppData\Roaming\.minecraft\bin\minecraft.jar
! The process cannot access the file because it is being used by another process.
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! Cannot rename __rzi_20.565 to C:\Users\jack\AppData\Roaming\.minecraft\bin\minecraft.jar
! Cannot create C:\Users\jack\AppData\Roaming\.minecraft\bin\minecraft.jar
! The process cannot access the file because it is being used by another process.
Can anyone help?