Windows NT4/2000/XP/2003 systems can be configured to hide all popup error messages that might show up during the boot login process, especially useful for computers configured to log on automatically into the GUI
Run Regedit and go to:

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Contro l\Windows

Right-click in the right hand pane -> select New -> DWORD Value [REG_DWORD] -> right-click on it -> select Rename -> change its name to read NoPopUpsOnBoot -> click OK -> double-click on it -> select Decimal box -> type 1 -> click OK.

To reenable the display of boot popup error messages, type 0 in the Decimal box above, or simply delete the NoPopUpsOnBoot DWORD Value.

Close the Registry Editor when done.

The changed setting will take effect next time you (re)boot Windows.