In that case the best option would be to create a new user account for yourself on that PC, then log into that new account and delete your wife's account from the PC.
Open the Settings Ap, then go to Accounts - Other Users.
Click the 'Add Account' button and create a new account for yourself on the PC.
Restart the PC and log into that new account you have created for yourself.
Click the Start Button, then just type netplwiz and press Enter.
On the resulting utility, select your wife's account and click Remove.