I guess you replied while I was composing my reply. On Vista, did you turn off UAC? It sounds a lot like an issue with User Account Control, or some other spyware/anti-virus software.
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Test machine:
Vista Home Premium / Toshiba Satelitte X205 / 2.0GHz Core2 Duo / 2GB memory / 2x NVIDIA GeForce 8600M GT
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