Sounds like a LOP infection. Drag the error message to the edge of the screen without choosing either option. This will usually prevent the message from occurring again and interfering with the programs you will need to run.
Please read and follow the process outlined
here.
Then download
Findlop by Metallica. Unzip it to your desktop.
Double click
findlop.bat. It will open a notepad file.
Copy the content of that file and past it here in your reply.