DLL : An attempt was made to load a program with a incorrect format

[jericsarmiento03]

how to bring back the old setup of autocad 2007? 
when I used it 2days past. i can access all the tool bar, 
but now when i open my AUtocad 2007, it pop.up ah phrase 
"an attempt was made to load a program with an incorrect format" 
and when i hit. "ok" the project will show, and can be accessible, 
but the toolbar and other are gone. and all shortcut keys can't be use. 
hoping to help me. 

[pendean]

That's a system level error: a Windows System Restore back to a month or year it all worked might help. undo any Windows Updates that have taken place during that time frame.