just like to say that i changed during writing of the prog. from windows 8 to windows 10.it may be relevant

[jeffrey123]

Thank you very much for taking the time Sir.

[_Bryan]

You are welcome!  I appreciate you updating us with this information.

Do you have a question?  Or just a statement?

Check if your version of LabVIEW is compatible with Windows 10.  https://www.ni.com/en/shop/software-portfolio/national-instruments-product-compatibility-for-microso...