Hello Paulo Afonso;
Thank you for your enquiry. To provide you with the best options will be better to provide us with the full model number of the Tecra A11.
But here are some links to help you.
For the Intel 82577LM
For the Centrino Advanced-N 6200.
The both model are A11-1110, an old but great computer.
At this moment I solved the problems with re-install of Win 8.1 again. Not work very well with option maintain the Program and user data, but, work with maintain with keep user data.
Our problem that we have some key software, that for we unlock them from our computer, we must have an internet connection. But we solved with a call to each one of supplier, explain what happen, and they support us with a great solution. We are talking of several K€ on software.
Thanks for your help, but up to now we got the problem solved, and already made a recovery usb disk, for bad days like last week,