I only play .avi files with Video Stream but all of a sudden an .avi file is being blocked from playing. I recently bought the lifetime membership and got the error when trying to play the second item listed in my Q. Could this be the problem? I tried the fix from Malwarebites Anti-Virus software you offer but that does not work. Your directions are for Free and Pro versions but the Free version has this info grayed out so it's not possible to do.

These directions don't work:
Add Process
Add Process will exclude a process that uses network connectivity i.e. skype.exe.
To add a process to the Exclusion List
Navigate to the location of the network process that you wish to exclude
Click the process to highlight it, then click Open.

I have the free version and with that, this option is grayed out. Also, I only play .avi files with Video Stream so I do not understand why, all of a sudden, an .avi file is being blocked from playing. I recently bought the lifetime membership and got the error when trying to play the second item listed in my Q. Could this be the problem?