HELP! screwed up authui.dll

[plutomok]

I was following steps to change / customize my windows 7 lock screen

one of the steps was to temporarily rename the authui.dll file found in C/WIndows/System32
 

unfortunately i got sidetracked by something else and didnt get around to pasting in the new authui.dll for the theme i wanted to install,

and i shut down my laptop before i completed the process

 

now my laptop boots into windows. but instead of the lock screen it now just shows me a blank black screen with the mouse cursor,

I typed in my password into the blank screen anyways just in case that would boot me into my desktop but it didnt....

 

I messed up, Im freaking out
Please help me LTTC

Thanks

 

SOLVED!
I plugged in my laptop's harddrive into my desktop 

and was able to go into the Windows/System32 folder and rename the file back to its original name

and now it works once again

 

*phew*

[PC-NOOB]

Recovery disk and repair?

[plutomok]

Recovery disk and repair?

I dont have a recovery disk for this system