1. Right click on xampp control and click run as administrator
2. click on config button at top right corner of xampp and tick on Apache and mysql then tick on start control panel minimized
3. Then create a short cut of xampp-control exe file in c drive
4. Then type run at task bar the in RUN type shell:startup then paste the short to that startup folder
5. and thats it now you can restart your computer to check the auto ON functionality.
Thanks!