HP Recovery (D) almost full

HP Pavilon Windows 7 64 bit desktop. I am 72 and don't understand much so be patient.
I have 3 external hard drives plugged in my hard drive. I use all 3 of them all the time so keep them on and running. I do graphic work for fun since I am house bound and almost chair bound. Could that be making it show that I have so little space? I am thinking what the red line is showing it is a partition. I know nothing about them. I have about 753 GB free on the C drive because I keep so much on the externals. I looked at HP website but all I found was they were selling all kinds of hard drives etc. I thought I had bookmarked a place where HP sold a program that made a new partition for $10 I was going to get that today and simply can't find it anywhere.

I don't use the email that is listed here but can go and find it online. I wanted to change my email but when I do it says that I am not listed under that email. I will go and check on the old email later today and tomorrow etc if the new one can't be used.
Thank you so much.