See if this Knowledge Base Article from Microsoft is helpful.
"System32 Folder Opens When Logging on to Windows XP, Windows 2000, or Windows NT 4.0"
http://support.microsoft.com/default.aspx?id=170086
If that doesn't take care of the problem and especially if you're using a Dell computer try this:
Open the MSCONFIG utility (Start/Run type in MSCONFIG click OK) and deselect (uncheck) the /L:ENG entry from
the STARTUP tab, click Apply, click OK and restart your computer.