I'd be using the Find utility to find any files over a certain size, then try myself to identify what they belong to. This sounds like something more sinister than system restore points. Could even be a bit of corruption in the file system, reporting a file size badly which is skewing the free space.
If it does turn out to be restore points you should be able to get rid of all but a handful. I really don't see it's that though.
Another thought - right click on the c:windows directory, and the c:program files then click Properties, just to see how large they are. Can't remember exact figures, but I think Vista would usually be under 10Gb and Program Files will vary depending on what you've installed, but another 10Gb wouldn't be unreasonable.
Last edited by: smokie on Tue 2 Mar 10 at 22:31
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