Updating your wireless network card drivers
Slow wireless speed can often be blamed on competing wireless networks, as described above, so changing your Wi-Fi channel manually Wired ethernet will always be better than wireless connections, but sometimes you don’t have a choice - all manner of mobile devices need wifi.
There is however one very basic step you can take which...
In most cases only one (occasionally two) things are at the root of the issue.
If the MAC address didnt change, try to disable and re-enable the Wifi network adapter manually from Network and Sharing Center Change adapter settings (or you can just enter Network Connections in Windows Explorer location bar).
While I am not very sure why it works with "02" I think it has to do with the MAC Address specification which uses first octet to set flags (see image below; courtesy Wikipedia.org) Setting first octet "02" actually sets the b2 bit indicating that the MAC address is locally administered.
In this scenario, you’ll need to open Device Manager (Windows key R, type and click OK), expand Network adapters, identify your wireless device, right-click and select Update Driver Software….
You’ll be prompted to browse for the new driver, so use the files you extracted and follow the on-screen instructions to complete the process.