Use USB HDDs connected to Xbian Pi on my Windows PC

[world-in-union]

I have two USB HDDs that I connected to my xbian Pi. I would like to connect to them on my Windows PC. In my Windows Explorer, they both show up in the Network section under "XBIAN", but I only have read access, that is I cannot write, copy or delete files on these two HDDs connected to the Pi from my Windows PC.

When I installed XBIAN on the Pi, I also installed Samba because with my very limited knowledge of the Pi (mostly from a beginner's book that does not cover XBIAN) I thought it would be necessary/helpful.

Any help would be greatly appreciated. Thank you.