cares to keep for installing two distro: system can't write to disk

Now I have installed Slackware 9.1 (and it was not so hard as it is told) after Windows 98 and SuSE 8.0, I'm in trouble yet with SuSE 8.0 because it is not starting properly: Some services can't be begin because the system can't write to disk. Why? Thanks for any help a.