When you log on to a network that uses Protected Extensible Authentication Protocol (PEAP), your credentials are stored for re-use. When you restart Windows XP, you are automatically logged onto the wireless network.
To remove your cached PEAP credentials:
1. Copy / Paste the following to a UserEapInfo.reg file:
2. Merge the UserEapInfo.reg with your registry, or run regedit /s UserEapInfo.reg.