Unusable disk partition

[Phil]

Thank you for reading this.

I have been given a physically damaged laptop that I've managed to get 
going. I decided to install Kubuntu alongside Windows 7 using the 
mini.iso. I've used the 32 bit mini.iso before but not to install 
alongside Windows.

I quickly discovered that there isn't an option to install alongside 
Windows so I shrank the 294 Gb Windows partition to 194 Gb leaving me 
with 100 Gb for Linux. Now the installer tells me that I have 100 Gb of 
unusable disk space and won't continue with the installation.

I thought that I would be able to format the unusable section with 
Gparted so that I would have a /, /usr/local/, /home and a swap 
partition but not so.

Gparted won't allow me to proceed because I already have four primary 
partitions and I cannot delete the unallocated section. I could possibly 
extend the Windows partition so that it takes up the unallocated section 
but I don't want to get myself deeper into the poo.

So, should I attempt to resize the Windows partition into the 
unallocated section and if that is successful is it possible to use the 
mini.iso to install Linux alongside Windows?

I'm reluctant to download the full 1 Gb iso file because it will bite 
heavily into my monthly allocation but if I have to then I will.

-- 
Regards,
Phil