Why do you want to remove and reinstall again? Because of upgrade your wallet software version? If so then it doesn't necessary to remove, simply you may install newer version from the
original website and verify Signature as well to confirm original copy of software. Your operating system should delete old software automatically, if not then you may delete it manually and install latest version.
Anyway your answer is here, your wallet file is stored separately from software. So even you delete your software it doesn't effect to your wallet file. But you must save your wallet seed to recover your wallet incase if happen something. If you restore your old wallet seeds during first time open new software then your old address will be there, means new wallet will regenerate your old address and replace the old wallet file. But be careful, likely you will not able to open new wallet file if you downgrade your software again. New wallet software will replace your wallet file with new features which wouldn't read old version.
If you really don't want to use old wallet file then select new wallet during open first time. So you will get new wallet file and new seed. I am not sure but likely you will be forced to encrypt your wallet file with password. So you have to write your seed and password as well. Anyway you will be able to recover your wallet with seed anytime, so it's more important to keep safe on multiple places. If you really want to delete wallet file permanently then you may go as below since you are using windows.
* Show hidden files
* Go to \Users\YourUserName\AppData\Roaming\Electrum (or %APPDATA%\Electrum)
Likely you will able to delete from above.