Several BSODs

[kamekai]

I'm pretty sure this is caused by TCPcrypt, as it has happened thrice since I've installed it last week, and my computer crashes extremely rarely. The only lead I had on the issue was that the BSoD screen mentioned a "passthru.exe", which after a quick search I found to be in one of TCPcrypts' folders. My machine is a Dell Inspiron E1505 with no related hardware modifications, running WinXP SP2. Help please!