That sounds like a fine spec for Vista Basic. More than a GB tends to be 'recommended' as best for Vista but you can run it fie on 1gb which you have (although some of that will probably be being eaten up by the graphics card as I believe that is integrated graphics).
Is it new and has this always been the case? Recently upgraded to vista?
It sounds more like some kind of configuration/hardware issue to me as I don't have dual core and only have 1GB of ram and I don't get any freezing/jerky response. It isn't as quick as XP but that's mostly vista for you on comparable hardware.
Video editing, if it is something you do a lot of would probably justify more ram (up to 2GB at least) and a dedicated graphics card possibly wouldn't be a bad idea. If you did those, which wouldn't be overly expensive depending on the graphics card, then at least you could rule out the harwdware spec as dual core should be plenty good enough.