problem with firefox

[rookie1010]

Hi

I have got a problem with firefox,
when i try to start it, it comes up with an error which says

the program must close to allow a previous installation attempt to complete. Please restart.


I did a restart but the problem still presists.

i remember downloading an update last night, but not installing it. now i am stuck with this error. please help

 

[Osiris]

reinstall FF or uninstall and then reinstall