You CAN download the regular IDE and it does work on windows 7.
When you installed CREATE did you say YES to the certificate and the drivers and any firewall permissions.
Saying No to any of those is enough to cause the plugin to not work properly.
Not 100% sure about your "device handler" problem as I cannot remember the plugin ever mentioning that.
The only time I have seen anything for INTEL was drivers for the Arduino 101 board.
It is quite safe to re-install the plugin as it will just over write the old install.
You have not mentioned which browser you are using and that's important information.