What is happening now with our point of sale systems is that windows have been doing a lot of updates recently with all these improvements and updates some of which have been really good?
However, sometimes for various reasons, the temporary files have not been cleared out plus as people have not been cleaning their hard drives and over time, the rubbish has collected on their harddrive. As such their computers have been running out of space. If you know what you are doing it's easy to clean.
However, over the years, people have written programs that allow a novice to clean the computers extremely well. My first choice to do this cleaning is a program CCleaner which I think is the best and free. It is a very good product for freeing up disk space by removing much of the rubbish that collects on the harddrive, including temporary files that Windows often leaves.
On this run, you can see I gained 2 GB of room on my harddrive.
You can get a copy here.
As always, take a backup before running it.