Disable any unused devices such as a floppy drive in the Setup (BIOS) - F2 at boot up. BTW, is that a 5150 instead of a 5050?  there is no 5050.
I recently returned Dimension 5050 to Factory settings.   All is generally fine but [NAME] Computer' shows an A Drive.  There is not a 31/2 Floppy Drive installed! I have uninstalled this and controller in Device Manager but every time I start up the OS finds new hardware and finds drivers and reinstates the A Drive. What can I do@
A Drive when not Present