do I need all of these executables on C drive?

What are they? I do not have anything like this.

Are the programs in Programs and Features? If so, and assuming you have the source, uninstall them and test

Also move old documents onto a USB hard drive. Old documents and videos/pictures can chew up a lot of space

You can try to clean space by using disk cleanup but manually deleting any file from c drive is not advisable because program installed in your computer creates those file and directories and some binary files. Check all programs installed from control panel and if you think you do not use any of them you can delete them.
C:\windows\system32\temp  stuff in this folder is OK 5o delete.

These are system files and so why go there to save space.?

A full blown Windows 7 system with Office and Adobe fits in less than 60 GB.

How big is your drive?

I agree with marsilies,  If you have space issues, these little executables are not going to make a dent in it.  Run a tree size space analyzer like the one he suggested to see where the big space is used.   One huge space consumer can be internet cache files from browsers.  If you run multiple browsers, they each create their own cache spaces.   Many decent cleaners are around.  My favorites are Glary utilities and CCleaner.   Glary has been around many years and does a nice job cleaning temporary files and browser files pretty safely.  CCleaner is also very good at cleaning that stuff, and a bit more aggressive about it netting a bit more space than Glary will recover, but with a touch more risk something needed gets cleaned.   Note, both come with additional tools. Glary includes a disk space analyzer too under the advanced >> Files & Folders tabs.

see:  https://www.glarysoft.com/glary-utilities/

See:  https://www.ccleaner.com/ccleaner/download

Most of these (I have Glary myself) clean up small amounts of space. Documents, videos, and photos are the big hogs which cleaners (rightfully) will not touch.

Thanks to all of you! I'll leave those the heck alone and try to find photos, etc to move to my external hard drive instead. Have a great day!