Is it possible to edit this value so that it isn't in the middle of the screen? I would like it off in the corner in order to avoid obscuring my wallpaper.
Not easily as far as I know.
You can manually edit the GINA, but you may be heading down a bad path if you do that!
There are millions of resources on this, they all seem to be as cryptic as each other so I cannot recommend one of another.
If you ask Microsoft, the answer will be "this is by design and cannot be changed".
a. Install Recovery Console
b. Downolad a copy of ResourceHacker
c. Find "msgina.dll" under \windows\system32 and copy it to the root (C:) folder
d. Start ResourceHacker and open msgina.dll from the root
e. Under Dialog-1900 replace the dialog with this one:
f. Hit "Compile Script" and save it (an original of your msgina.dll was saved automatically under C:\ with the name "msgina_original.dll")
g. Restart the computer and choose Recovery Console at start up
h. Copy the new .dll into "\windows\system32" and "\windows\system32\dllcache" (hit "y" when it asks for rewriting existing file)
these are the commands:
i. type "exit"
j. Now when your Windows restarted and you Lock your computer there will not be any pop-up window. To unlock just simply hit ALT+CTRL+DEL