Windows command line tool to check NSS usage

We've been using the old NDIR command from NetWare to help our users keep track of
their disk usage on their OES2 NSS home directories. I pipe the output from NDIR
/SPA into a VBS script where I compare it with the user's space limit. The problem
I'm facing is that we're looking at adopting Windows 7 64-bit, which won't run old
DOS apps like NDIR. Can anyone suggest a replacement command line tool (32-bit) that
will report how much space a user is using on an NSS volume? Alternatively, can
anyone suggest some other method of keeping people informed about their NSS usage?
Thanks.

-Jim Wagner