Hi and welcome to the forums, Banafsgy.
If you want to do a complete reinstall (to fix some glitches and such), then sure, you'll need to uninstall all these EPs and the base game. But, as far as I know, to install an expansion pack (WA in your case), you have to have the base game on your computer.
Also, you can reinstall the base game and not uninstall all the EPs in the process.
And please don't change the color of your text, we are not allowed to do it here. Thanks! Good luck.