To No.1MaxthonFan and Oliver One :
1) I did´nt install something new
2) I uninstalled with "Special Unistaller"
With the Task Manager, when the window with the MsgError appeared, I found a process running called "MXinstall*; I deleted it and now Maxthon open.
I´m so happy because I like a lot thih browser.
Anyway, thank you very much to both of you for help me
Jorge