Just a few random thoughts that might help. Not much info to go on.
- Did you recently install something (new program, updates, etc) that caused CP/taskbar issues? Uninstall.
- Did you have recent malware problems? Run full scans with your AV and free Malwarebytes
- Have you tried System Restore
to a date/time prior to issues?
- Have you checked for damaged or corrupt system files? Use option two this tutorial
from elevated command prompt. If problems are found run scan 3 times rebooting after each scan.
It would help if you filled in your system specs (top menu bar any forum page > User CP > Edit System Spec left column.) Also helpful to know how long this problem has been going on and how you first noticed it (did it happen while you were on the computer doing something or did you shut down the machine and there it was the next time you powered back up?) Please post back if anything above helped or not.