Hello, @Abdul !
What should I do if my administrator password isn't working on my VM?
The simplest solution is to reset your administrator password to ensure that you are using the correct administrator username/password (and not mistakenly something else):
https://learn.microsoft.com/en-us/troubleshoot/azure/virtual-machines/reset-rdp#reset-by-using-the-azure-portal
To reproduce this, I created a Windows 10 VM and reset the password (I also reset the username for this example but be sure to back up any user specific data prior to a reset):
After the password was reset, I was able to log back in as an administrator and perform administrator tasks (run elevated, application install/uninstall):
If you are still running into issues after a reset, please let us know in the comments. It's possible that we may need to look at specific OS behavior, or specific requirements for the application that you are trying to install. I hope this helps!