To expand on Neemobeer's suggestion: - The first run of the "Disk clean-up" scan does not find files that have accumulated over months and years of Windows updates. These files are no longer needed but remain on the computer. To find these requires the following procedure: -
1. Tye "Disk clean-up" in the run box and hit the "Enter" key to open the program. Then click on OK to run it the first time.
2. After the search is complete do NOT click on "OK". Click on "Clean up system files" instead and then click OK. This will cause it to run a second time and it will take longer and find a lot more files to delete. These are the files I mentioned above.
3. When second search is finished click on "OK" then click on "Delete Files" to start the...