got the same prob...
I've searched around and noticed a lot of people having problems with intel's 2200BG wireless. The problems range considerably but none so synonymous with my problem as the one in this thread.
My girlfriends laptop wireless works fine everywhere but at my house (e.g. school, her home, friends house, hot spots, etc.). It's not that the connection didn't work before it just suddenly doesn't work now. I updated the drivers, turned off the security, changed the router, ip renewed (which is done by [start]->[run] then type [cmd]; at the prompt just type [ipconfig /release] then [ipconfig /renew] all without the square brackets).
Everyone else at my house can use the wireless just fine (e.g. my brother, my sister, myself). Connecting directly with a wire is fine as well. This has definitely become an intriguing problem that I would definitely like to be rid of. I'll post back if I find any fix but I would also like to know if others have the same problem and how/if they fixed it.
I guess its possible that a spyware fix created the problem but I assumed if it was a spyware related network issue then why just my network at home and not other places. It also could be a mac cloning but if that were the case then could a person hide their comp name from my router because it doesn't show any id as connected on the router; the mac address doesn't have an assigned IP address from the router and I cleared any logs, left if for a few days and then checked while still trying to establish a connection.
There was a problem similiar to this that may help others though. All I did was change the wireless channel on the router from 11 to 9 and it fixed the problem at her house but not mine. Conflicts for wireless space with her neighbour was definitely the problem for just that case.