This is the info on my partitions when Xfce is open.

[Richard Barmann]

http://paste.ubuntu.com/12152556/

sda1-Not Mounted Boot Windows
sda2-Not Mounted Linux
sda3-Not active-Linux Swap /
sda4-Not Mounted Linux

sdb1-Not Mounted Linux Boot
sdb2-Busy-Extended  (would this be the Xfce?)
sdb5-/    Linux
sdb6-Active Linux Swap  /

Can you tell me how to proceed to set the partitions to try a reinstall 
from an .iso
Dick Barmann