Why can't I sign in to the Windows Store?
If you're having problems signing in to the Windows Store, check to make sure you entered the correct Microsoft account and password. If the info is correct, but you're still having problems, you might need to reset your password.
To reset the password for your Microsoft account
Go to the Reset your password website.
Choose the option that matches the problem you're having, and then follow the instructions on the screen.
Choose how you want to reset your password, and then follow the instructions.
After you've reset your password, it's a good idea to add as much security info as you can to help make your account more secure. If you forget your password, or if someone else tries to take over your account, you can use this info to get your account back.