Screen saver will not stay on

Having a challenge with my screensaver. Running Windows xp sp3. We have set up the screensaver to activate after 5 min of inactivity then after 10 min of screensaver the monitors will power down. However, what screen saver activates after the 5 min period but only stays on for 11 - 20 seconds then returns to active screen. This is a fairly new issue.

We used CClearner which took care of the issue however it has returned. We did a full reboot. We noticed that Windows did an auto restart to dl some updates this morning. Could this possibly be the problem. Any suggestions would be welcomed

Thank you in advance...