Found something that worked for me. For now at least.
Download the offline client on another computer that doesn't have the data error (probably best to not have a .minecraft folder in %appdata% on that computer beforehand).
Log on and start a new world in minecraft on that computer then save and exit.
Then copy its %appdata% .minecraft folder.
Get rid of the .minecraft folder in %appdata% on the computer with the data error.
Then paste the .minecraft folder from the good computer into %appdata% on the computer that has the data error.
The computer suffering the LMZA Data Error should now run Minecraft!
Sloppy but at least it's a working solution to the LZMA Data Error.
PS. My OS is a XP 64bit and I copied the files from a XP 32bit.
Edit: Whenever you quit Minecraft, make sure you end the "javaw.exe" process in task manager, or else when you start Minecraft up again, it'll just just hang on a black screen.
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Download the offline client on another computer that doesn't have the data error (probably best to not have a .minecraft folder in %appdata% on that computer beforehand).
Log on and start a new world in minecraft on that computer then save and exit.
Then copy its %appdata% .minecraft folder.
Get rid of the .minecraft folder in %appdata% on the computer with the data error.
Then paste the .minecraft folder from the good computer into %appdata% on the computer that has the data error.
The computer suffering the LMZA Data Error should now run Minecraft!
Sloppy but at least it's a working solution to the LZMA Data Error.
PS. My OS is a XP 64bit and I copied the files from a XP 32bit.
Edit: Whenever you quit Minecraft, make sure you end the "javaw.exe" process in task manager, or else when you start Minecraft up again, it'll just just hang on a black screen.
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