Wireless network connectivity issues after upgrading to Snow Leopard

After upgrading to Snow Leopard (10.6.4) I find that my wireless network will not automatically connect to my router (Netgear DG834G) as it used to. First impressions are that the macbook is finding a number of wireless networks but wants to connect to the one that is alphabetically first in the list. It also seems that the signal that the airport is receiving is weak, even when the macbook is next to the router.
Has anyone experienced this when they upgraded?
Any and all help gratefully appreciated
Nick

but a couple that I used with no problem before I upgraded now give me a "server not found" error after I enter my login and password.
Quit Safari. Open Keychain Access   /Applications/Utilities. Select Passwords on the left.
Delete the keychains for the sites you have problems logging into AND the Safari Forms Autofill keychain. Now from the menu bar click Keychain Access / Keychain First Aid. Select: Verify. If necessary, select: Repair. You will be prompted for your admin password. Click Start.
Relaunch Safari. Navigate to a site. Login with your user name and password. That will create a new keychain for you.
If you still have problems accessing sites, go to Safari / Preferences then select the Security tab. Click: Show Cookies. Delete all cookies or just the one's for the problematic sites. Now try logging into a site again.
Even though you upgraded to v10.6.7 make sure Safari is up to date. From the menu bar click Safari / About Safari. If it's a version prior to 5.0.5, click your Apple menu (top left in your screen) then click: Software Update...
And check Safari / Preferences - Extensions. Something there may be preventing you from accessing secure sites. If you have any extensions installed,  turn that off, quit then relaunch Safari to test.

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