@MalhadoPT Please run a dxdiag, upload it to a free third-party filesharing site, and link it here. (This site's virus scanner is currently not working and instead blocking access to all uploads.) This error often happens when there's a problem with the driver for the graphics card, although it can have other causes, so I'd like to see what card and driver you have, and whether there are any obvious errors.
Please also let me know whether you've ever edited graphicscards.sgr or graphicsrules.sgr, or added a copy of either file to ConfigOverride. If you haven't, please don't do so now; I'm just wondering whether you have.