In this case yes. It is necessary to update the PROSet driver to the latest we have. You can get it here:
http://www.intel.com/support/wireless/wtech/proset-ws/sb/CS-034041.htm
Now I am in doubt with something here. You say you have the Wireless 7260 but also you mentioned the WiFi link 5300 AGN card (which is an old product now) so my question is, what is the wireless you have?
You can check this information under Network Adapters in Device manager. Let me know please.
Kevin Masis