Juan,
Try checking a Vista report for specific errors and corrective measures to
take: Click on Start (icon) and select All Programs. Then, select
Maintenance > Problem Reports and Solutions. When that report opens, select
from among the Tasks on the left margin and elsewhere. Peruse the report and
look for any specific information about what caused your problem (or other
problems while you're at it). If you get some insight from the report, take
the corrective action suggested in the report. Just something to try, since
Vista logs errors and hopefully it will in this case. Let us know whether
any of this is useful. We like to know, too.