vista restore points keep disappearing - sometimes the next day, sometimes the same day w/o rebooting -
really- this morning the size of the sys volume information folder was 800 mb - now it's 20 kb!
of course sys restore says there are no restore points available

no it's not a dual boot setup
and no i'm not low on disk space

dont know if this is related or not but there is constant hard drive activity since i installed vista
even with indexing turned off

update: i found a tweak on the net to manually set the size limit of system restore (i set it to 2GB) - i played around with the limits and noticed sometimes a single restore point was over 3 gigs!
humm- could be that if the size limit is smaller than the restore point the whole restore is dumped - guess i assumed vista would 'trim it to fit'
can't see why you need over 3 gigs for a single day but it seems to work now (i set it to 10GB)
the tweak:
vssadmin resize shadowstorage /On=C: /For=C: /Maxsize=10.0GB