Yes, both BitComet and CometBird software are safe for your computer. In order to fix the issue, I suggest you press Windows + Pause/Break key combination and open Device Manager. Expand the Network Adapters list, right-click on the driver and select Uninstall. Reboot your computer, press Scan for hardware changes icon from Device Manager and reinstall the network drivers. If the problem persists, you will need to contact your Internet provider.