script to add DWORD SearchboxTaskbarMode to windows 10

Well, you could do it the old-fashioned way and just save that as it is as Whatever.cmd, and assign it as a logon (not startup!) script:
Create System Startup / Shutdown and User Logon / Logoff Scripts
https://technet.microsoft.com/en-us/magazine/dd630947.aspx

But since Server 2008, there are Group Policy Preferences, which allow you to configure registry settings as required, without using scripts:
Configure a Registry Item
https://technet.microsoft.com/en-us/library/cc753092.aspx

thanks oBdA - yes i went through adding to the registry but its not working - after its added via GPO it not showing up on the client PC's that is why i went with the script

Did you check whether the GPO in question was applied to the user(!) in question?
Either through the GPMC (can run remotely against a client), or locally on the client with rsop.msc?

yes i checked this is what my GPO results looks like

ok trying it now...

i added the script to logon in the GPO and its not even showing up the the GPresults. the logs are not showing up on the user PC either. its about 20 minutes now since

Going from memory here: select the GPO (not a link) in the left pane; in the right pane, under one of the tabs, you should see the replication state of this GPO for your DCs.
Start troubleshooting from there.

well - replication looks fine . i will check other way s to deploy. thanks for all your help oBdA

set it as a logon script and attach it to user profile