Please note that the Intel® Wireless WiFi Link 4965AGN is a mature product which support is almost over.
At drivers level the last Intel® PROSet/Wireless Connection software that is compatible with it is the 13.5 beyond this version the Intel® PROSet won’t detect the Intel® Wireless WiFi Link 4965AGN.
Also the latest driver version is the 12.4, therefore if you update to a newer Intel® PROSet/Wireless Connection software version the driver will still be the 12.4
Then yes you should roll back to an older version.
The problems you are seeing shows an Operating System that is been tainted it is possible that you need to reload the Operating System on it.