problems of disconnection

The product is attractive because of its small size, I could easily install it, but the problem is that the connection works a little as she wants. The key is not always detected at the restart of the PC .... after a ride on various forums, I tried things moult, uninstalled and reinstalled the program, without result. So I spent 3-4 hours trying to fix it, to no avail ... I would suggest therefore rather an internal PCI card Netgear deemed more stable.