I'm using CopperLan 1.3 (3) on my studio pc (Windows 7 64-bit) and to date, it worked without any problems. By the way: thank you for that fine software, it´s fantastic!
Now I just tried to install the MusicLab RealGuitar 3.1 update that includes a virtual MIDI driver - and I got a BlueScreen. Same scenario with RealStrat and RealLPC update.
I then stopped the CopperLan-Service ... and the installation succeeded. Maybe you can check this?