Sometimes Windows XP gives you the following message in the system tray: "Windows needs your current credentials....
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Please lock this computer, then unlock it using your most recent password or smart card. Please click the icon to see more information."
This appears to be a random bug in Windows XP, but here's a quick fix you can apply.
- Click Start, Run and type GPEDIT.MSC.
- Under computer configuration, expand administrative templatessystemlogon.
- Select the "Always wait for the network at computer startup" value.
- The default state is "not configured." Set this to "On."