Wireless can not activated

If you've re-installed Windows from a Microsoft DVD instead of through Acer eRecovery, you need to install the wireless network driver. You can download it from Acer Support: http://www.acer.co.uk/ac/en/GB/content/drivers

For the same reason, you may find other drivers from Acer Support are also required. Check in Device Manager for any missing drivers (unknown devices are flagged with a question-mark).