Have seen this pesky one in the past with 2008 r2 as well.
Can get this sometimes when you try and create a new Scheduled Task via the command line (schtasks.exe), the following error appears:
“WARNING: The task name “<>” already exists. Do you want to replace it (Y/N>?”
followed by when you hit Y, then this message will appear:
“ERROR: Cannot create a file when that file already exists.”
Navigate to c:\windows\system32\tasks and manually delete the task by name, and do likewise from the Scheduled Tasks GUI. After that you’ll was able to re-add the task (which had the same name)