I am required to delete the file parent.lock but when i try delete it, it says its already in use and when i close firefox it dissapears and i can't find it to delete it. I tried a file unlocker and it says the same, so how do i delete it?

I have all files visible from control panel i am running windows 7 home premium.

That file could be set as a Launch Agent or Daemon in your ~/Library or /Library, You could try to look for it or Safeboot your computer and then empty the trash. Safebooting disables Launch Agents/Daemon and Third Party Kernal extensions. Here's the article to Safeboot OS X: What is Safe Boot, Safe Mode? - Apple Support

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