Ashampoo Firewall Professional Problem

[nakash]

Hey,i installed a version of 'Ashampoo Firewall pro' and sometimes i get a blue screen with error that includes the file: DrvFltIp.sys
I didnt know that its something with the firewall so i searched the file and i found it inside the firewall dir,now .. when i remove the firewall i dont get any blue screen but i need good firewall and i heard that is a good one.
so i took a file and changed his name to DrvFltIp.sys, then i replaced it with the exist file in the ashampoo directory,i didnt get any blue screen so far,
i hope this'll be okay,but if not what should i do? should i remove the firewall?