Lost home network on WiFi after updating to 10.6.8

Updated my iMac and wife's Macbook to OSX10.6.8 and have lost WiFi  connection to each other. We can both access the internet but her Macbook cannot access the printer connected to my iMac. We can connect without any problems using ethernet wire but, as we work in different parts of the house this wastes so much valuable working time carrying the laptop back and forth. It is not an option to go back to using wire links in our situation. We have tried all the suggetsions that have been offered in various forums but none of them work for us.
What has Apple done to us? We have both been singing the praises of Macs for years but this is beginning to shake our faith immensely!
If all else fails, how difficult is it to regress to a previous incarnation of 10.6?

Hi Bob
I'm still figuring my way around this so before you read any further this is nit an answer to your problem; however I am having the same problem, sort of; just a few days now I noticed that when connecting to the internet wirelessly via my router, the connection would inexplicably fail. In order to carry on working I connected the Mac to the router using ethernet and all is, and stays ok. Go back to trying to use a wirerless link, after a short period of time it fails again; I'm not too sure of the way things allwork but I notice that my wife's iPad is working fine wirelssly, as is my airport express, and indeed the printer. So wireless between my Mac and everything else bar the router is fine.
When trying to use the wireless option in network prefs, Ive noticed that after a certain period of time the ISP, Server and Network lights in Network Status under Diagnostics change from all green to either amber or red.
As I said this happened real sudden say 4 days ago. My Mac is new purchased December just gone. I'm really confused as to what to do, and sadly I'm not knowledgable to work oiut where the fault lies, is it my router somehow, or is it the Mac?
Any help would be greatly appreciated.

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