SO the question is, are you using Wireless or not? If you use Wireless in KDE then you need to setup and use Wallet.
If you use Network Manager for a wired connection, then Wallet is not required but might come up if you had an aborted attempt to set it up for some reason. In that case you would do:
Menu / System / Desktop Applet / KWalletManager / Settings / Configure Wallet / Wallet Preferences / and uncheck the Enable the KDE Wallet Subsystem and then log out and back into KDE.