It`s pretty much the same as XP. Go to Accessories>System Tools>System Restore and click on the link to go to System protection. It will check the partitions and tell you if System Restore is on for the D partition and the last restore point date. I presume you can then switch it off for that partition and this will clear the restore points, freeing up space again.
It is the Restore Partition, its a Medion with a small Restore Partition You can save file to to the bit thats left, but my son would not know how to do that. So only thing I can think of is being Vista System Restore keeps trying to create new Images for that Partition and there will be no room for that. I alway turn it off for all Partitions other than Operating System one
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