There was a laptop that initially ran Aero in spite it didn't meet the requirements. An update ended that issue. The poor owner was upset about it but when we check the laptop docs, Aero was not noted anywhere and (again) it didn't meet the specs.
Can you tell us the make, model and such so we can check if yours fell into that category?
after i downloaded some updates from microsoft aeros stopped working, i tried system restore, but it didnt work, and the feature is not listed anymore, is there a way to have it back without having to reinstall windows