|Firstly, thanks for your messages. It feels good to know there are helpful people out there. |
Here is what I have now found out:
The file system is NTFS.
The results of the CHKDSK are as follows:
15750708 KB total disk space
15087112 KB in 154098 files
84416 KB in 42481 indexes
0 KB in bad sectors
307728 KB in use by the system
65536 KB occupied by the log file
271452 KB available on disk
4096 bytes in each allocation unit
3937677 total allocation unitys on disk
67863 allocation units available on disk
When it had finished running CHKDSK I went back and looked again at the free space. It was magically back up to 262 MB. Could CHKDSK have caused this change?
My virus protection, AVG Free 9.0 (version 9.0.864) indicated that it was out of date so I clicked 'update'. It needed to download 14 MB. I told it to go ahead.
While it was doing the update I got another 'low disk space' message.
Then I got a 'very low disk space' message.
The update completed. Free space was now showing 148 MB.
I went exploring and managed to view the file sizes. I told it to show all hidden files and system files.
I again totaled the folder sizes, finding the ones I could view (using mouse-over because it doesn't actually list folder sizes) now significantly lower in total than before.
There were two large system files that became visible:
pagefile with 1,560,576 KB, and
hiberfil with 1,039,668 KB
There is also a folder called 'System Rollback Data' that shows a different size each time I roll my mouse over it. It started out saying it is >4.86 MB, then later >681 MB.
I think that is everything.