vista suse11 Raid 1 dual boot

Hello All,
I am trying to install Suse 11 on a computer that has following configuration
64 bit Intel 9300 processor
4 GB Ram
500 GB (Raid 1, condigured from Bios)
First, I installed 64 bit Vista to primary partition now I am trying to install Suse 11 64 bit.
In Disk preperation stage, I select BIOS Raid and for installation I select my unassigned third partition. Installer proposes me partitioning. Then I pass to installation stage. At this stage installer makes partitions and format them then stops with the following error message:
Failure occurred during following action:
Mounting /dev sda1 to windows D
System error code was: -3003
mount -r -t ntfs -ousers,gid=users,fmask=133,dmask=022 /dev/sda1 /mnt/windows/D:
mount:/dev/sda1 already mounted or /mnt/windows/D busy

I couldn’t find solution to this problem, I tried several things but couldnt manage. Could you help me for this problem?