unplug the external HDD
At the command prompt, type the following lines, pressing ENTER after each line
set devmgr_show_nonpresent_devices=1
cd %SystemRoot%\System32
start devmgmt.msc
device manager will open...
click 'show hidden devices' under View...
expand all the nods under device manager
there would be many greyed out entries or entries with exclamation marks in device manager. Usually these nodes are displayed under this node 'Non-plug&play devices'. Uninstall all these under all the nods and thn restart the computer and plug the HDD to the computer and check if it works.
cd %SystemRoot%\System32
start devmgmt.msc
device manager will open...
click 'show hidden devices' under View...
expand all the nods under device manager
there would be many greyed out entries or entries with exclamation marks in device manager. Usually these nodes are displayed under this node 'Non-plug&play devices'. Uninstall all these under all the nods and thn restart the computer and plug the HDD to the computer and check if it works.