Try this:
Missing cswgina.dll File After Removing or Upgrading to ACU Version 4.14.001
After removing or upgrading ACU to version 4.14.001, the cswgina.dll file can become missing if you respond incorrectly to a message indicating that a file is locked (CSCdt42742). (The appropriate response is to click Reboot.) If you respond incorrectly, a message appears just before the Windows logon screen opens indicating that you are missing a file called cswgina.dll and to see your system administrator to retrieve it.
To work around this problem, boot to a DOS prompt. Then copy the msgina.dll file in the WinNT/System32 directory over to a file named cswgina.dll.