Probably any system file or files that were created by the system
for its own use. Files like those are actually owned by "Trusted
Installer" and not by Administrator, so you need to go in the
Properties>Security tab and change the owner from Trusted Installer
to Administrator. I think it's a reasonable precaution against
malware which would like to overwrite system files, logs, etc.
I actually consider most older software written for Windows to
be malware because the installer would routinely replace system
files with the version it happened to prefer. Absolutely mind-
boggling. I'm thankful that Vista put an end to it, finally.
Thanks... it worked ;-)
Now, although I understand the underlying principle and reason behind
this, I still say that it's way too complicated for casual users. Just
consider what I simply did: I removed MS OneCare using Vista (the
proper way), but when it came time for me to delete the no longer
needed backups on the external drive, Vista refused to let me do it.
Although I knew what to do after you directed me to the right spot (I
should have known), I am ready to bet that the vast majority of users
will not have a clue as to how go about changing the permissions to
get rid of these large yet now useless folders ;-(
Up to now I like Vista... but I am very curious to learn how
frustrating it will be for casual users who need to do what I just did
(casual users don't visit newsgroups).
______________________
The Traveller
Oceanside, California