boot error

[Franci Nabalanci]

Hi!

My system is FreeBSD releaese 8.2.
I installed KDE 4.6.1 and run it. And I updated ATI drivers too.
When I start KDE It freeze when I try to change a background picture.. After
restart of computer I got an error and boot in the single mode.
/dev/ad0s1a: LINK COUNT DIR I=376823 OWNER= ROOT mode 40700 SIZE=1024 MTIME=
Mar 27 ...COUNT 18 SHOULD BE 19
/dev/ad0s1a LINK COUNT INCREASING
/dev/ad0s1a UNEXPECTED INCONSISTENCY: RUN fsck MANUALLY
Automatic file system check failed: help!
ERROR: ABORTING BOOT
(sending SIGTERM to parent)!

If I manually run fsck -p (for example) /dev/ad0s1a I got permission denied.

Please help.

Thank sin advance.