"mount -o remount,rw /" hasnt change anything.
But I was getting an idea. I could install Vectorlinux on an VMWare machine, and could take the fstab file from the new install. So I could grab the content of the "damaged" fstab file and would paste it in the new file, but this time using mousepad on Linux for it. And then replace the damaged wih the non-damaged file.
Barely I couldnt install it, because there wasnt any harddisk detekted...
So i will try it with an LiveCD, hope it will work then.
EDIT: Unbelievable, I fixed it!!!!!
I have opened the damaged fstab file with textmaker again and saved it as an doc-file onto my old mp3-player. I have booted up an liveCD with VMWare and have taken the fstab file from it. So I only had to take the content of the damaged fstab file and paste it into the non-damaged, but using AbiWord to take the content of the doc-file and mousepad to paste it into the new fstab file. So Iam now having an non-damaged fstab file, that i replaced with the damaged. Also the filesystems arent checked anymore while booting!
Hmmm, what a nice feeling to be online with Linux again!