problem partitioning during installation

[HolidayEquipe™]

hi all...
i have an errore during installation..the error say that can't format a partition because it's busy...
i tried all kinds of parttions...i have three disks
2 serial ata
1 ata 133...
the strange thing is that the installation is good in my new notebook...serial ata 7200 rpm...but i have problems in my desktop computer

[joost]

I think you mounted the partition.
Perhaps by accident by opening it in konqueror?

To unmount, you may want to try as root: umount -a

[HolidayEquipe™]

tnx for reply...
i must mount partition during installation.../ for root...
if i don't mount...and go to format..it's ok...but when i continue installation...it say me that i have no select a partition mounted by / to install sabayon...
i don't use konqueror because i select text installation