Firefox Problems

I run FF 1.0.7...here's my little problem. After I exit, and then want to restart Firefox again, I can't. It wont fire up. The cursor will show a sand clock and nothing will happen.The only way to get FF running again is to end the process...which is not the best thing to do. Also, I can't delete the shortcut. It gives me an error saying Cannot read from source or something like that...I tried re-installing FF 1.0.7 still no good...any one got any ideas? Oh and restart solves the problem for a little bit.....
Cheers,
Ashar
Cheers,
Ashar
