First run fsck -n on the file system to see how many and what type of problems exist. Then run fsck(1M) again to repair the file system. If you have a backup of the file system, you can generally answer "y" to all the fsck(1M) questions. It is a good practice to keep a record of all problematic files and inode numbers for later reference. To run fsck(1M) yourself, specify options as recommended by the boot script. For example:
# fsck /dev/rdsk/c0t4d0s0
If you do not have a backup, ask an expert to run fsck(1M) for you.