I haven't seen the "Invalid plugin" error in this forum for a while, but there were quite a few of those in the early days of 2011.
If I remember correctly, in most cases it was an old version of a software called "babylon" that caused the error. Uninstalling or upgrading that software resolved the problem.
If you do not have that software on your system, please post again.
No, I do not have that software on my system.
But thanks anyway.
What I would do if this happened to me...
- go to C:\Program Files (x86)\Adobe\Reader 10.0\Reader
- rename folder plug_ins
- try Adobe Reader again
If the error disappears, then I would try to find what plugin is causing the error; most likely a non-Adobe plugin.
I have the following files in my plug-in folder: