Dell monitor? See "OSD Lock" here. (Other monitors may have similar controls.)
If needed :
One of the startup programs is the culprit.
How to troubleshoot a problem by performing a clean boot in Windows Vista
How to Check and Change the Startup Programs in Vista
Autoruns - Free - See what programs are configured to startup automatically when
your system boots and you login. Autoruns also shows you the full list of Registry
and file locations where applications can configure auto-start settings.
Hope this helps.
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