For netbook, never get one that comes with Vista. Still, what done is done.
I'm not sure if Win7 will live up to what it claim, even though beta version is available. Wait until three months time when Win7 is available. So, if I were you, I'll move back to XP. But your problem will then then locating all drivers for the nb.
For slow response, try to use registary clearner to see if it helps. Compact your hard dirve may also help. Currently, I'm using PCtools product but the donw side is it ain't free.