Netgear Wireless Modem/Router

[gra001]

Guys, I've had internet access problems over the last 48 hours so reinstalled my router, I now have access but 'security type' is 'unsecured'. The Netgear guide recommends WPA2-PSK (I can see other networks in the area also have this) but when I select I lose connection with a message saying computer settings are not compatible to the network. If I select 'disable' all OK but obviously I'd like some protection...............advice very welcome, thanks!