Yes, you can install
WUBI on any of your "usable" drives(by usable I mean, partitions other than your
system and your
recovery drives). If you can backup the data on the F drive(if it matters to you), you can delete that partition first, create as many
logical partitions under the new logical partition that you can create using this free space. At present it is not possible to create a new partition as MBR allows only 4 primary partitions and a logical partition is considered as a
primary partition in this count. However, you can create any number of logical partitions inside a logical partition. That is why you need to delete this first. Hope you got it. Post it, if you have any problems.