Please see the most recent updates in the "Where did the .com name go?" thread. Posts number 16 and 17.
Can't you just use the control panel to clear out your system restore points, then set the maximum size to use to 1% (the lowest available)?
In Win7 it's control panel\system\system protection. Then hit "configure", you can then delete all system restore points to free up the space, and set the slider to the minimum amount of space to use as possible. You can also disable system protection entirely if you don't want to deal with the hassle of clearing out system restore points again in the future.