NTFS directory security changed

Twice on my system I have had the default security of root C: and thus all

subdirectories under it, change to Everyone - Full Control. I noticed the

change after some programs began acting strangely. I then reset the root to

the default security back and propagated it through all the subdirectories.

All seems to be ok again, but this is the second time and I know I didn't go

into the drive properties and change the drive security permissions.

I have scanned my system with both AV and spyware scanners, but have come up

empty. Does anyone have any ideas what could cause this to happen?

I am running XP Pro SP2 with all updates applied, running on a 2003 Server

domain. I have AV protection on the system as well as being behind a

corporate firewall.

Thanks

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