Failed ETC2 compression

Hi friends!

I need help with this. Recently I have installed Unity editor 32 bits 5.3.1f1 on Windows 7 64 bits, but before I had installed the Unity 64 bits but it doesn´t work with Vuforia 5 SDK then I had to change it for 32 bits.

Now, When I import a texture from the asset store I get an error like this "Failed ETC2 compression" (no more information in the console) but if I try to import a texture from the PC the error is "Failed ETC2 compression UnityEditorInternal.InternalEditorUtility:ProjectWindowDrag(HierarchyProperty, Boolean) UnityEditor.DockArea:OnGUI() "

If I change the format in the params of the texture to another different to "Compressed" the texture works and I can see it. But If I change again the format to "compressed" the error appears again like this "Failed ETC2 compression UnityEditor.DockArea:OnGUI()". Each error is repeated several time for one texture (over 6 or 8 times, in the consolelink text).

I have tried to fix the problem with solves of the other topics like copying the file vcomp100.dll to SysWOW64 or closing Dropbox etc but the problem still follows.

Attach the "Editor.log"

Thank you for your help in advance!