Managing Domain workstations

We have a newly formed domain. So far we have 4 workstaions that we have
migrated onto it through active directory.

We have been adjusting settings and we can now manage these PC's through
Group Policies but is there anyway of veiwing files stored on the local HDD?

We need to be able to monitor what users are storing locally as we have lots
of "naughty" users, who are using their worstations as their own personal
equipment. By this I mean they are stroring mp3s, mpegs and unauthorised
software.

If this can not be done is there any way of logging on remotely as the
administrator while the user is still active on the domain account? Or even
another way. Has anyone encountered this problem before?
.

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