something very weard here, my post just got corrupted for a second time with no reason, as i wasnt in edit mode so this basic overview is all i can be bothered to retype, simple enough though , theres other related older posts iv made if you really want more info, so search on poppper and wireless perhaps!.
1:move your ground floor router (the worst place you could to run it from given 3 floors), to the first floor, as the rule is, the higher you put your router, the better, stronger and ferther its signal will travel.
2:make this cheap DIY 'Windsurfer' parabolic reflector and place on your existing routers arial , works well
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http://www.ispreview.co.uk/news/EEAFApAuVERaihBGAY.html
http://www.freeantennas.com/projects/template2/
or 3:buy this if your router can take 3rd party arials
http://www.maplin.co.uk/Module.aspx?ModuleNo=38205
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buy a second router, place it on the top floor, wire it to the first one with ethernet, set it on another channel, and you have made a cheap longer reach wireless extender/wireless roamable setup....