Unable to open firefox, dialogue box says program already open but not as far as I can see.

Recently when I log on to my pc and try to open Firefox, a dialogue box appears and tells me something like - firefox is already open, close firefox and try again. As I haven't opened firefox, I don't know what the dialogue box means. I went into task manager and the firefox program was not shown as open. I clicked the processes tab and deleted firefox from the list. I use Firefox 4 b9, this also happened when I had 4 b7. I uninstalled the former but no change. I reset system to earlier date, ran a virus check but all ok. I downloaded Firefox 3.6, then followed the upgrade for 4 b9 and all was ok until I was using my media player 2 days ago and tried to watch BBCiPlayer at the same time which is when the problem arose again. Also Firefox extremely slow to open. I managed to get online this time by going into History and clicking a website I used some time ago before all the above happened.

I am using IE to post this message on Firefox.
It has happened again. At 23:05 (UK time) I openedFirefox on the firefox site not IE. I opened my btinternet.com email account but at 23:41 the tab had not opened fully and still trying to load. I closed firefox and tried to open it again and here are the correct details of the dialogue box which appeared.
' (?) Firefox is already running. To open a new window, you must first close the existing Firefox proces, or restart your system'.
I cannon do a restart at present as the tv part of my pc is recording a movie so I will try again later.
Anyone out there that can help us please? Thank you.

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