80211g broadcasts at a higher frequency therby making more easliy blocked by walls, cabinet, large furniture, etc.
To be practical, you have nothing to gain by switching to 80211g. While it runs at a higher frequency(hence the faster throughput), you'll still encounter the same problems(and than some) you have with your 80211b setup.
Try putting the router in a place that has the fewest obstacles between your PC and the it. And, as stated above, metal surfaces, conduit, cabinets, etc. can block/disrupt the signal.
good luck with it.
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