Linux Mint Forums

I am assuming you have a partition for Mint. Choose to manually partition, click on the partition you want to install Mint on. Then choose to edit the partition. There should be options to format, set mount point, etc. Click on the drop down menu for set mount point and choose /. That is the symbol for root(root partition where mint will be installed). Look at these instructions for more detail. It is the same installer http://www.psychocats.net/ubuntu/installing

i think it is saying you have not designated a partition to be the "/" root partition.

so you have windows and at the partition part of the install you chose manual.
Now leave the windows partition alone.
You can delete the partitions setup by suse and create a new / and swap partition.
or
you can select you old suse / partition (the reiser one i expect) and edit it, making sure its mount point is set to "/" root. (no quotes) the default file system used is ext3 but you could leave it as reiser, just make sure it has a format tick by it.

then carry on installing