When I'm trying to open my internet browser, (CometBird) it tells me that it is allrady running and I need to close it before I can open a new one. When I look at task manager it dossen't show that it is open. How can I close this thing or is it just something wrong with the program.

Open Task manager in that open Processes and find the process for iexplorer.exe and end it.
Close task manager.

This will work.

Have you tried restarting computer and trying again

Neither helped. This is the message that pops up:
"CometBird is already running, but is not responding. To open a new window, you must first close the existing CometBird process, or restart your system."
Any ideas?

This happens to me in Firefox I go to my desktop ,right click my mouse and hit refresh .

Ending the process should work however, you have to end the rigth process... which in this case would be COMETBIRD.EXE (iexplorer.exe).

Try that... if that doesn't work, then there would seem to be an issue with the version of CometBird that you have. I would then try uninstalling and reinstalling a clean copy.

Do you have any other Firefox apps running at same time

Does it come with any plugins that may be starting on startup or anything

Nothing visible. But I had to reinstall Firefox and now it works fine. Thank you guys for all the tips:)