Hi Bruce...
Thanks for your answer... I have the XP OS with SP2 in my notebook computer . The rare thing is that in my desktop computer I have the same OS and it is perfectly ordered. However, the notebook is the most I use...
I did not asked to Mecanique because I thougth this may be of general interest for more users,and maybe some of them have had the same trouble and had it fixed.
Greetings...
Ruben de la Pena V.