freebsd - boot error

[freebsd]

I am working in freebsd 6.0 unix system. Currently I am installing apache and
php. Now I am not able to boot it normally. When I boot unix it
automatically enters into the single user mode 
The error is
'ad0: FAILURE - READ_DMA status=51<READY,DSC,ERROR> error=40<UNCORRECTABKLE>
LBA=7509039'
CANNOT READ BLK:
UNEXPECTED SOFT UPDATE INCONSISTENCY
 
Note: I got this second time. First I reinstalled freebsd to rectify, but I
dont want to do this again because I went through long into it
 
I searched some sites which asked me to use fsck but in vein
Please help me

regards 
Arun
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