autocad error 2009

[FIGOR71]

from a few days as soon as I try to change a design in autocad appears the following error:
autocad cannot continue. try to save changes in a file until the last command is placed....... .
You can help me solve it. . . .
I have already tried to restore the program... .

Thank you.

 

[PlannerRoad]

tried to install the upgrade 3 of autocad 2009?

 

[FIGOR71]

tried to install the upgrade 3 of autocad 2009?

I tried doing a reset to the previous system configuration and it seems to have worked. . .
If he were to recover, I'm trying with the upgrade 3 already downloaded.
Thank you.