A. Right-click the Windows button, then select Run... entering shell:startup and clicking OK, and then move items one by one to the Recycle Bin.
B. Remark out entries listed HKEY_LOCAL_MACHINE>SOFTWARE>Microsoft>Windows>CurrentVersion>Run.
C. Manually disable all startup tasks currently listed as enabled and reboot, checking for issue resolution at startup.
D. Open the Startup tab and methodically disable items currently listed as enabled and reboot, checking for issue resolution at each startup.