Crashes after I changed atig6pxx.dll to atig6pxx.bak to fix other bug

Put the summary of the bug you're having here

What I expected to happen was...:
I thought it would load minecraft, i changed atig6pxx.dll to atig6pxx.bak to try to fix error 87: parameters incorrect.

What actually happened was...:
It crashed

Steps to Reproduce:
1. change atig6pxx.dll to atig6pxx.bak
2. ... then start minecraft
3. ...