Problem with adding/removing data drive

Hello,

whenever I remove or add my data (no system files, just MP3s) Z:, I get following error:

http://img82.imageshack.us/img82/7391/comodofo3.png

Of course I have no directory called “Program Files” on my Z: drive. Comodo is installed on my primary drive C. Why am I getting this error? I do believe it is a bug in Comodo Firewall (I have the latest v3). Or is the problem somewhere else?