i used¨partition magig to rearrange my disk.
i have now 3 partitions.
1 for windows xp didnt change it.
1 45GB partition.EXT3
1 6.5GB partitionEXT3
the last one is a logical partition inside a extended primary partition.
this screenshot makes it more clear
http://img167.imagevenue.com/img.php..._122_461lo.JPG
i dont know why this last partition is inside another partition,partition magiq did this automatically.

is this a good setup? which partition should i use to install linux?

----edit----
and it seems like there is already space in use on the 45gb partition, the yellow colored space.