Basically to set an partition active from the OpenSolaris live cd is this:
fdisk /dev/rdsk/c0t0d0p0 (in case c0t0d0 is your hdd)
Total disk size is 19457 cylinders
Cylinder size is 16065 (512 byte) blocks
Cylinders
Partition Status Type Start End Length %
========= ====== ============ ===== === ====== ===
1 Other OS 0 191 192 1
2 IFS: NTFS 191 9879 9689 50
3 Active Solaris2 9880 19453 9574 49
SELECT ONE OF THE FOLLOWING:
1. Create a partition
2. Specify the active partition
3. Delete a partition
4. Change between Solaris and Solaris2 Partition IDs
5. Exit (update disk configuration and exit)
6. Cancel (exit without updating disk configuration)
Enter Selection:
Just specify your active partition with option 2 :D
Regards
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