i had real probs with my netgear router (although its apparantly a very good unit). One thing is to change the channel. They say 1,6,11 are the ones to use, but in reality all are fine. I think microwaves and phones affect certain channels, as, of course, do other wireless routers, so that may help boost it.
Also, try and get you router as central to all of your pcs as possible, but apparantly higher is better than lower.
Finally, how about an access point? Works kinda like a tv ariel boaster and you could have it on a different floor to your router
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The return of Ra!