Question, can I choose what partition to install Wubi in?

I've had it running on my laptop for a while and I like it. I've always wanted to install Linux on my desktop however the HDD that has availble space I tried to unallocate keeps giving me an error when I try to make it give up space. So I figure maybe I could use Wubi to install it onto my F partition and run it from there. I can't install it on C since I only have about 9 GBs left on it.

Is it possible to choose which drive to install it in yet?

yes it is. in the settings, before you click install, select what drive you want to install it on in there. it should say something like:

Drive 0
some stuff about size
Drive 1
some more stuff about the size

just choose which one you want it installed on. click on the details about the drive to select it, not the drive number.

Note that only drives with enough free space are listed (4 or 5 GB depending on wubi version)