Hey,
So I had this same problem. and its quite easy to work upon.
Go to C drive then go to program files and search for TxGame Assistant. (In other words search for the installation folder wiith the name TxGame Assistant)
Now In Tx Game Assisstant folder go the folder name UI.
Now Scroll Down And search for an application called Android Emulator (with the tencent gaming buddy logo on it.)
Wait for it to open. if you can see the pubg logo then it is installed, click on it and start playing.