# Cannot open user preferences menu anymore

I'm getting some error and cannot open my User Preferences window anymore.

I was doing some Python addon development (nothing fancy, just iterating through objects), loading and unloading my addon and at some point I must have killed the User Preferences window. Now when I try to open it by selecting File > User Preferences, a popup displays "Failed to open window!". The console displays:

Win32 Error# (3221692624): <no system message>


I've tried restarting my computer, but that didn't help. I've also tried deleting my script from C:\Users\&lt;user&gt;\AppData\Roaming\Blender Foundation\Blender\2.78\scripts\addons.

What can I do to restore my User Preferences window?

• Have you tried to move your addon file so they will not be loaded anymore? Apr 7 '17 at 23:08
• Yes, I deleted it from my Blender home scripts directory. Didn't help. Apr 7 '17 at 23:48
• Just reinstsalled Blender too. Didn't help. Apr 8 '17 at 0:03