Hi Martin,
I have tried yous suggestions, my disk is not full, I have deleted the temporary folders and deactivated my antivirus, but none of this worked.
The file that I sent you before I could manage to open it here by going to it´s folder and opening it, but if I try to open it with the PVSol already open using "open project" it shows the same error that I sent you before. Anyways, the file that I really need to open is more than 5 MB and I cannot send it to you here (there is a 5mb limit), is there any other way I can send it to you? I have installed PVSol in another computer and this specific file did not open in this other computer too.
Thanks,
Diego