I have an Acrobat Reader software on my computer, but a while ago it started closing the file about 3 seconds after I open it, and it says: "Invalid plugin detected. Adobe Reader will quit".
I tried deleting it from the computer and re-downloading it, but it did the same again.
Can someone help??
What is your operating system?
I have seen this message a couple of times over the last few months, and it was often caused by an old version of something called "Babylon".
If that is not your case, just delete all the plugins. (How to do that depends on your operating system and Adobe Reader version.)