I downloaded and installed a trial version of R-wipe&clean 9.1, I had tried 9 and was ready to purchase it. I ran a scan on my C drive, it completed and I checked my C drive, instead of the 45.6 it was, it had risen to 72.5 (about half the drive) I had to go out and on return I checked, in properties the whole drive was blue. I downloaded ‘Spacesniffer’ but I am not sure how to interpret the results and what course of action to take. I have, as you can see managed to free up enough space to use the internet.
It is possible that there is a hidden partition for repairing C if that becme corrupt.
Even so it is suspicious that the drive continued to fill up while unatended.
Different people make individual choices over what to put on C:, if they have an alternative drive to use.
In the short term I suggest you buy a powered external drive (with USB connection). Then cut as much data as you can find (Picture files, movie files, and music) and paste these in new appropriately named folders on the external drive.
Unistall the Space sniffer and R-wipe&clean 9.1, plus any other software files you don't use any more. Do not uninstall any basic Windows stuff nor any major applications. This should give you many Gb of precious space.
You may now be able to do most things as before but do start with either of the anti-malware programs Nontek suggested.
If things really are better then it's high time to take matters further, and consider alternative ways to marshall your data, but let's make some space on C: first.