Windows Won't Boot Due to a Missing DLL File

Two days ago, my computer wouldn't log on to Windows. It would go as far as the "Welcome" screen then a notification window would pop-up saying "This application has failed to start because SCESRV.dll was not found. Re-installing the application may  fix this problem."

Since it wouldn't go as far as that pop-up, I couldn't do anything else but to restart the PC and hope that the notification would not appear on the next boot. But, of course, it appeared over and over again, with me already feeling hopeless.

I wouldn't wanna resort to reinstalling Windows and all the programs on the PC. That would be so much work on a Monday. Lucky me (and bless my searching instincts) that I found this simple instructions on a certain forum that I couldn't remember anymore.

The instructions were so simple I closed my netbook's browser and turned to the "malfunctioning" PC the minute I read it.

It's like this (given that your PC's first boot device is your optical drive):

1. Insert your Windows CD installer to your optical drive.
2. Press any key on the prompt: "Press any key to boot from CD..."
3. Press "R" on the first menu (which asks you if you want to Repair or Install a fresh copy).
4. Type which partition you'd like to repair. In my case it's "1" since I only have one partition.
5. On the DOS prompt, do the following:

type cd c:\windows\system32

press <enter>

type expand d:\I386\LSASRV.DL_

*replace .dll of the filename with .dl_
*change "d" to whatever letter you optical drive is

6. Type "exit" to reboot the computer and your done.

If new notification pops up and your PC still won't boot, just take note of the new .dll file on the notification and replace LSASRV.DL_ on Step number 5 with it, noting that .dll on the filename should be typed as .dl_