How to repair File System Error - unattached inode 37138

My computer says:
- checking Root file system
- / contains a file system with errors
- unattached inode 37138

Then, I gave my Root password (for maintenance)
then the screen said:
(Repair filesystem) 1 #

My question here is: What is the command I should type in there ?

I tried to use fsck <Enter> and then the screen said:
Parallelizing fsck Version 1.18 (11-Nov-1999)
If I type "exit" the screen says:
can't create lock file /etc/mtab ~88 (or 89) read-only file system

By the way, I used to have RH6 and I upgraded it to RH7.0,
could this be the problem? Should I upgrade to RH9, would this be my best bet?

I am really at a loss of what to do, your help would be very much
appreciated.

Charles, Kelowna, BC

i think you'll need to remount the root filesystem as read/write from the prompt altho im not entirely sure what the mount command extensions are. its something along the lines of 'mount -n -o remount /,rw' but i dont think thats quite correct. then you have to run the fsck program that corresponds with your chosen filesystem (ext2, ext3, reiserFS etc). the one for reiserfs is reiserfsck followed by an extension.

thats all i know