It wont be labeled as a "filter driver" on the website.......... this is in laymens terms the driver that controls the special functions on your specific keyboard such as quick launch keys etcjust look for the standard drivers for your specific keyboard model... it will contain what you need
what model laptop? and this is Win7?
its the one on their site labeled HP Quick Launch Buttons........ I see you have 2 threads going on the same topic...... and in your other thread you said you just updated this driver............ try a Rollback......... or delete and reinstall
unless theyve changed it for Win7 just goto the device manager and right click on your keyboard in the list and select properties