|Two ideas come to mind. |
If it is still working then don't do anything.
I assume it to be ATI graphic's program to set display settings.
If system broken then might consider see event viewer logs to start, reload ATI program or update it, set system restore (in windows) to time when it did work and last choice is to restore computer to OEM state with DVD's or CD's.
"Best Practices", Event viewer, host file, perfmon, antivirus, anti-spyware, Live CD's, backups, are in my top 10