Dear Sachingarwalla,
don't worry about the kernel crashes and nautilus crashes - these occur at
some time but are in most of the cases of no harm. Just consider filling out
the automatic bug reports and sending them to improve fedora in future.
If your disk has many bad sectors you should think of exchanging it for a new
one. This is a physical issue, not a software issue. A few bad sectors are
also no problem, they're just excluded from your file system. But if bad
sectors accumulate the harddisks lifespan is usually reached and it is about
to fail in near future. So I'd urge you to get a new harddisk to prevent data
loss. By the way: You could update your system to Fedora 15 since there are no
security updates for Fedora 13 any more, Fedora 13 reached it's end of life.
Sincerely yours,
Maximilian Imgrund