failover - How to build a fault-tolerant Windows file share?

I have a primary and a backup windows 2008 server, and a
bunch of windows XP clients that map a drive to a share on the primary server. If the
primary server goes down, I want those client machines to automatically re-map their
drive to the backup server, so they can continue to access the
files.

Should I try to write a
vbscript or python script or something that detects if the primary server is down and
issues the appropriate "net use m: \server\share ..." but I need that script to run
every minute, no matter who is logged in. Can I do that with windows "scheduled tasks"
?

I'm a Unix guy, and could use any tips you
have to offer on accomplishing this. Is there a better
solution?

many thanks,
-Ian

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