Root Mounting Read Only

I have this issue with SuSE 9.2 (sorry, but I love the old desktop). Because this is purchased version of SuSE, its full of software. I installed it one year back and all was OK. But now root mounts read only. I am prompted to do:

mount -n -o remount,rw /

Of course this is done but then I have to exit, it reboots in same RO mode.

Often root mounts ro because errors were detected. Are there any errors during booting. Might be an idea to boot it single user and run a filesystem check on the root partition.