Well... I am quite new to this and started with my gridseed 3550 asic just today.
So please be patient if I ask silly questions.

I installed the gridseed on my windows 7 machine via USB and I see the gridseed installed as COM3.
When I start the bfgminer.exe I am prompted to enter the URL, worker name and password.

After that I can enter the device manager and try to add my gridseed. I use the example provided in the device manager and enter "erupter:\\.\COM3"

The bfgminer gives me then the message: "failed to sanity check in lowl-vcom.c windows_usb_get_string():392"

What did I do wrong?