maybe it's your laptop? have you taken a look at task manager (ctrl - alt - delete) and looked at the cpu/memory usage? It could just be that it's bottlenecking and then when it can breath again you are getting your speed back. I think vista has a few funky performance monitoring tools that might help. How about closing down your anti-virus and other running software if this is the case and giving that a go.
If the drivers don't come with an executable you probably just need to load them from within Device Manager which you can get to by right clicking My Computer and going to properties, finding your Display Adapter then going to Driver and clicking Update Driver - it will ask you for a path and you can point it to an INF file in that directory.
Good luck! Gotta shoot for an interview eep!
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