Files Self-Duplicating - Help?

In Documents and Settings, the first four folders are
your computer name (5QXXXX21), Administrator, All Users,
and Default User, plus three more. Since two days ago,
the 5QXXXX21 folder and the Administrator have duplicated
twice, duplicated all files, with creation dates of 6/9
and 6/10. The first duplication contains exactly the
same info as it's parent except for a cookies file. But
today, the second duplication contains not only copies of
the partent folder but copies of every folder and file on
my computer. The list of folders now is 5QXXXX21,
Administrator, Administrator.D5QXXXX21,
Administrator.D5QXXXX21.0000, All Users etc. Does anyone
know what might be happening? At this rate, my disk will
be full in a couple of days.