Caot create partition after swap partition is created

I have Ubuntu on a computer and that is working fine. I find everything that in need by searching the net.

Now, i'm trying to install it on a computer who has already Windows 8.1 on it for a dual boot. I have the C for Windows and a D drive for my programs, documents and all the rest. I did install some other flavor of Linux un the past without any problems.

Noe, I already have some free space available for Ubuntu. When installing, i choose "something else" and i can see /dev/sda, the windows 8 installation partition followed the D drive and at the end the free space that i want to use for Ubuntu.

Following instructions that i find on the net, i created a swap of 512 meg by clicking on the empty partition, after that i'm not able to create anything else it's unusable. I tried different options but i caot get it to create the / partition, the swap and the home partition.

What do i have to do to make it work.

Thanks