I get following errors when I try to install:

[codeConfiguring disk (c1d0)
- creating fdisk partition table
- creating Solaris disk table (VTOC)
- Processing alternate sector slice

Creating X86Boot partition
- creating filesystems on fdisk partition c1d0p1

Creating and checking UFS file system
- Creating / (c1d0s0)

ERROR: File systems creation failed for / (c1d0s0)
ERROR: Could not check or create system critical file systems
ERROR: Could not update disks with new configuration
mkdir "/a/var/sadm/launcher" : Read only file system
ERROR: Could not update disks with new configuration


[/code]

What do I need to do to fix this problem?
Thanks.

You do not need an X86Boot partition, but this is unrelated to the problem you describe.
Are you trying to install Solaris on unusual or faulty hardware ?

No.

Try with another hard-disk if you can...