Help with license key trouble

[metsin032000]

Delete cf and reinstall check firewall or antivirus

Of course as a 2 plus year user i did those.It has to be a bad license key I used cf on this laptop until my old key ran out 2 weeks ago it is a brand new laptop with cf as the only thing installed .Worked fine 2 weeks ago now when i click activate i get cf not respondidng.however if i remove the L key it responds with invalid key.