This is not an issue of the intel galileo hardware. So this is NOT the correct answer.
I base this affirmation on the fact that:
I have the same problem on 8 windows 7 machines.
I tried installing the driver manually, uninstalling and reinstalling, changing usb ports, restarting board etc. NOTHING worked. The serial ports item from the tools menu is gray.
BUT using the same intelGalileo board
I have successfully installed the ide and tested the blink code on 2 macbooks with OSX, one XP machine and on a windows 8.1 machine.
For my distributed applications laboratory at the university of Craiova, Romania I need my Intel galileo boards to work with windows 7. Win7 being the OS installed on the 6 labs of 15 computers each.
So please assign an actual developer to investigate this problem. i am at your disposal if you need help.
Looking forward to being contacted about this.