Can't connect to wireless network after Mac OS update

I just bought a mid-2007 Macbook (2x2 GHz, 2 Gb), which came with OS X 10.5.1 installed.
I connected to my wireless network (WPA2 Personal) without any problems and ran Software Update. This worked fine, including updating to 10.5.3.
But now I can no longer connect to the wireless network. It either times out when I enter the password, and/or crashes the Network Preferences.
I tried re-installing the system, but the installer said it couldn't install on this mac. That happened both with the 10.4.6 discs I got with the Macbook and with the 10.5 disk that came with my iMac.
Any suggestions?

Hi tankfield
Sandra has already addressed the reason why you can't use the wrong CD-ROM to re-install OS X.
However, the reason you had problems in the first place is that the 10.5.3 update contains some unacknowledged (by Apple) issues which cause flaky wireless connection. The same problem also appears on the latest update of Tiger. Apparently, not everyone is affected, but if you are then it's a real issue.
There appears to be no single solution, just several suggestions. Off the top of my head, these are:
- In your wireless router, switch off Mixed mode and only use G or N
- Change the wireless channel so it doesn't class with the neighbours router
- Don't use WEP encryption, only WPA or WPA2 (good advice anyway)
- Put AirPort first in Network Preferences, and your home network first in Preferred Networks
- Create a dummy location which is a clone of Automatic
.... and many more - none of which worked for me.
Finally, today I came upon this one which (so far) seems to be working.
- Start up Utilities/Terminal and type this command EXACTLY followed by return:
sudo sysctl -w net.inet.tcp.delayed_ack=0
(It will ask for your password)
In the unlikely event of this working for you, you will need to re-apply each time you reboot.
Good luck
Bob

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