Limit the storage space of system restore in Vista

You can reset the value of the Maximum Shadow Copy Storage space setting using the command:

vssadmin resize shadowstorage /for= /on= [/maxsize=

On my problem system, I reset the Maximum Shadow Copy Storage space setting to 15GB using the command:

vssadmin resize shadowstorage /for=c: /on=c: /maxsize=15GB

Once the operation was complete, I restarted the system, and everything has been running normally since.