Iphone and ipad can find network, iMac and macbook 10.8.2 cannot

Question

Had a network fault. When fault was fixed, ipad/iphone & Dell studio xps laptop reconnected automatically. Imac 2012 and macbook 2010, 10.8.3, can see network but not connect automatically. Tried connecting to network and get message connection timeout has occurred.
Got connection by;
Open Network preferences
Join other network
enter network name select - Security wpa2 personal
enter network password
However - I need to do this after every sleep/reboot - is there a fix for this?
PS - I noted that I had previously been on WEP security setting and had real problems connecting to external devices consistently, such as epson wireless printer BX935FWD, and Western Digital My Book Live Duo. Since moving onto WPA2, these connection now work consistently, but macbook and imac always need to be forced to connect to network, in manner described above
Does anyone share a similar problem/managed to resolve network issues? - very frustrating.....must be an OSX issue as all other devices connect without issue.

Answer 1

I've managed to download 10.8.2 for my MBP Retina 13.3" but when I try and install I'm told that none of my discs are suitable i.e. Internal solid state drive with 370 GB available, or attached thunderbolt drive.   Meanwhile my iPhoto won't work. This has arisen because I migrated from an older MBP which was already running 10.8.2 and had latest iPhoto onto a factory fresh 10.8.1 machine.