the free space surrounded by the c drive contained by frozen disc vary consequently and at hand even though no files r software etc added why

the free space surrounded by the c drive contained by frozen disc vary consequently and at hand even though no files r software etc added why

Further to the swapfile answer ... your System Restore will also use up disc space ....

Regularly defrag and occasionally dump the System Restore Files (make sure you've enjoy system stability before dumping though)
Run scandisk.
The operating systems frequently use a record (the swapfile) to suplement the ammount of RAM (this procedure is called "Virtual Memory"). The size of the swapfile is never alike and, if the swapfile is located on the "C:" drive, is normal to own less free space when the swapfile is bigger and more freespace when the swapfile is smaller.
the pagefile is your most predictable culprit in this instance although your internat hustle and bustle adds everypage you download to your computer so cleaning it out regularly help in fixture to the points mentioned by other users.
It may be due to the addition of updated software, storage of Temp files etc. I can contribute you a link that deal with sturdy drive problems. Some drive problems can be easily fixed by yourself using well available tools. I found the info at http://fixit.in adjectives. Try this site, if you can get what is required.