OS XP Pro SP 3
RAM: 1.5G
Yes the 10GB free is on C: (That should answer both questions)
Total part size:32GB
Yes I have other parts, but I dont see how that plays into anything
AVG is totally gone. Used to be real nice, now just as good as Norton.
I am running Space sniffer to see where its going, Ill let you know what I find. It could be a horrible coincidence and not avast.
The other partitions would had been relevant if you were not using C:.
Your RAM should be enough, so in theory the swap shouldn't be the problem. You could check this by running some scan and simultaneously checking the page file size in Windows Task Manager (together with the RAM usage).
Although it shouldn't be relevant to HDD free space, you could check if there are any "leftovers" of previous security tools. Anything using "too much" or unnecessary RAM, means other tools need to use the swap more (so, in a way, it could be related to free HDD space).
Try not using other nonessential software while you are running the scans, so to free RAM and swap space for the scan, and so your tests (task manager, RAM, swap, space sniffer...) about this issue can be easier.
Please report back any results.