task scheduler doesn't save task

I have webroot's spysweeper, installed on 3 pcs....and two run xp...scheduler
is fine on those. but on my vista pc....it will not save a scheduled sweep
of the pc. it looks like it saves it..but then when i leave that tab and go
back in the schedule tab, it is gone! i spoke with webroot, and they say it
is a known issue with vista's task scheduler....I verified this by running
the task scheduler directly, and scheduled up some tasks, saved them...then
after clicking OK..the task list refreshes, but my new tasks are not there.
so it seems it is an issue with task scheduler. does anyone know the fix for
this???
Thanks!