Can't connect to wifi - unless I boot into 10.5 first

I just upgraded my MacbookPro to Snow Leopard 10.6.4 and at first everything seemed to work.
After a few hours however I lost wifi connection and couldn't reconnect - I could see the network but airport wouldnt connect to it.
I trawled forums and tried a variety of fixes - trashing system configuration, changing location, changing channel, network name, security, open dns, static/dynamic ip but havent found anything that works.
The strange thing is if I boot from my leopard back up and then restart into Snow Leopard wifi will work no problem for a varying amount of time - sometimes a few hours - before I lose the signal and then I can't reconnect.
Anyone got any ideas cos frustrated I am.....

Even though I live in a rural area with few neighbours, even though the network works faultlessly with other operating systems, I did try changing the channel of the wireless network but to no effect. I doubt this is the problem tbh.
I erased the disk and did a clean install of 10.5.3 but migrated my network settings from my Leopard back up. Still no joy I couldnt get on the network.
So I gave up, went back to Leopard. Life is too short.
Maybe my router is incompatible with Snow Leopard, or maybe there is a problem with the OS.
As an end user it makes little difference, it doesnt work. Oh well.

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