Windows 7 - Windows cant verify the digital signature of Ci.dll Wont boot

Hey, my comp all of a sudden reboots and the message i get is that windows failed to start because it cant verify the digital signature of CI.dll.

Status: 0xc0000428

I do not have the installation disc. It is a dual booted computer with two identical windows 7 x64. I use dual boot to keep my Music Creation separated from my internet and gaming OS.

I will be very grateful if you any helpful tips, if i cant get it to work all of my music will be gone and that would devastate me.

can you boot in Safe Mode ?
A secure file check sounds in order here.
SFC /SCANNOW Command - System File Checker

It would really be in your best interest to obtain a windows dvd.
If you have valid keys you can download a disc image straight from amazon and use it. (just make sure you choose the right version)
Download Windows 7 ISO

Use the F8 key during boot to access alternative startup options. Instead of choosing Safe Mode, there is an option to Disable Driver Signature Enforcement. Select this and see if you can get into Windows. I am working on a computer that is giving that error during a failed System Recovery. The user managed to create user accounts somehow but then it got stuck on installing a software package (22/23). When I used the DDSE option I got to the initial screen to choose a user account. When I logged in, it resumed the software installation where it had gotten stuck before. That installer hides the fact that Windows is running behind it. If you use Ctrl+Alt+Del and start the task manager, the installer hides it too. However, if you use Alt+Tab fast program switching, you can bring the Task Manager to the foreground briefly but the installer will hide it quickly. Move your mouse cursor to the area where Task Manager appears because you can click once before the installer hides it again. Click once to highlight the task that's running, then again on End Task to get all the way into Windows.
The customer in my case did not have any data to preserve so I just used Alt+F10 right after POST to begin a System Recovery.

Hope This Helps