Too little byte-space on hard-drive means you are going to have to do one or more of the following:
-- get a bigger hard-drive; have both OS and data partitions on that larger hard-drive
-- add an additional hard-drive and move your data folders and files onto that 2nd hard-drive
[I'm not including Users folders, that's a whole different complicated procedure which can bring more grief than joy]
this 2nd drive can be your d drive, your data drive; leaving the original hard-drive being the OS, C drive
-- uninstall any/all un-needed, un-wanted, un-AskedFor 3rd party utilities, programs, WhatFors, Whatevers, and so on; do NOT attempt removing Windows Prime services, modules, programs, etc. at this time
I was going to suggest downloading, installing, running MiniToolBox and Piriform's Speccy, however that will have to wait until you have cleared out some of your 3rd party stuff.