Making F1-F12 keys the default on Dell Inspiron 1545
Solution 1:
In many Dells there's a BIOS setting that will default Fn to on. There probably will be in the 1545.
Solution 2:
On my Dell XPS 15, it seems to be as simple as me accidentally pressing the Fn Lock button behind the Escape key. If you have this problem, simply hit Fn+Esc and it should revert back to normal, without having to go into the BIOS