thanks for your answer mitchell
Sadly, I disabled system restore for lack of space in my HDD (It was a stupid move, I know).
Now that I'm thinking about it, the problem should be related with dll's. a couple of days ago, I installed a theme that needed some dll replacements but I didn't noticed the issue until yesterday.
Do you know which dll could be storing that image?
It's a minor issue, I know. I can live with that, but if it has a simple solution, I will love to be able to fix it.
thanks again, and thanks for praising my english but I know is bad

, I learned it from LOLcats basically
P.S. I love your signature.