How to Fix User32.dll Error – c0000135 Blue screen of death

A user32.dll file is a part of Windows User API (Application Programming Interface). Its one of those files that interact between users inputs (from the programs) and windows OS. Most of the programs depend on this file. So its dangerous to remove this.

To fix the problem related to User32.dll, the following steps help,

1. Turn on windows automatic update. If you haven't already, click the start button, click Run, type sysdm.cpl, click Automatic Updates tab and choose "Automatic (recommended) Automatically download recommended updates for my computer and install them" and click ok.
    
2. If there is an User32.dll error after installing a program or hardware driver, uninstall that program and reboot your PC. Maybe there is a fault with that program or driver and you need to install the latest version of it.
    
3. If above steps failed, problem lies with the User32.dll file itself. Get a Windows OS CD that you installed your current version of windows with. Open the CD drive folder, navigate to i386 folder, and find User32.dl_. Copy that somewhere temporarily and rename it to User32.dll. Copy that now to C:\Windows\System32 folder, when prompted to rewrite that, hit ok.
   • If your prefer using recovery console, in case when you are unable to boot the PC. Insert the Windows OS CD, xp or vista or windows 7, whatever you have installed. Select the right booting if you have multiple boots. Enter password when prompted. A blank password for the windows xp home edition. When the welcome screen appears type R to start Recovery console. At the command prompt type, expand [CD ROM DRIVE]:\i386\user32.dl_ c:\windows\system32. CD ROM DRIVE is the drive letter for cd rom. In my PC its J:\. Type Exit, hit enter and restart the PC, remove the CD Rom for the normal boot.

This must do it for you. If not, you can use system restore to a point closer to today's point. Also i recommend that you clean the mess off your PC's registry using a Registry Optimizer Tool to keep your PC's health in good condition, in addition to of course, antivirus, antispyware and disk tool checkups.